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Comparatives

Comparatives compare a quality: tall → taller, nice → nicer, big → bigger, happy → happier. You can name the second item with than. When the comparison is already clear, than is optional.

Published

Comparatives of short adjectives: -er

What a comparative means

A comparative shows that a person, thing or situation has a quality to a greater degree: taller means greater in height, and colder means lower in temperature. In the basic pattern, than introduces what we compare it with.

The direction matters: if the black suitcase weighs 9 kg and the blue one 12 kg, the black one is lighter than the blue one. Correct grammar with the facts reversed is not a correct answer to the situation.

How to build it

X + be + adjective ending in -er + than + Y

adjective
—
A word describing what someone or something is like: happy, tired, interesting.

The black suitcase is lighter than the blue one.

The black suitcase is lighter than the blue one.

Lighter describes the first item; than introduces the second.

Today is colder than yesterday.

Today is colder than yesterday.

Two states at different times are compared.

Which adjectives this rule covers

At A2, the target group is most one-syllable adjectives: tall, short, fast, slow, cold, cheap. It also includes two-syllable adjectives ending in a consonant + y: happy, easy, busy, noisy.

Most other two-syllable adjectives and longer adjectives normally use more: more useful, more expensive. Some two-syllable adjectives allow both forms, such as cleverer and more clever. Good, bad and far have special forms that we learn separately.

How to build it

Usually one syllable, or two syllables ending in consonant + y → -er / -r / -ier

This path is shorter than the road.

This path is shorter than the road.

Short has one syllable, so its comparative is shorter.

Anna is happier than Olya.

Anna is happier than Olya.

Happy ends in the consonant p + y; change y to i: happier.

Regular -er and a final e

For many short adjectives, simply add -er: tall → taller, cheap → cheaper, slow → slower. The base word remains unchanged.

If an adjective already ends in e, do not add another e: add only -r. Thus nice → nicer, safe → safer, large → larger.

How to build it

tall + er → taller; safe + r → safer

The red shelf is taller than the white shelf.

The red shelf is taller than the white shelf.

Tall simply takes -er.

This bridge is safer than the old bridge.

This bridge is safer than the old bridge.

Safe already has e, so add only r.

When to double the final consonant

In one-syllable words ending in one vowel letter + one final consonant letter, we generally double the consonant: big → bigger, hot → hotter, thin → thinner. Do not double a final w, x or y.

Do not apply this operation to every word ending in a consonant: clean → cleaner, cheap → cheaper, slow → slower. Start with reliable, common patterns and check an uncertain word in a dictionary.

How to build it

big → bigger; hot → hotter; wet → wetter; slow → slower

My room is bigger than yours.

My room is bigger than yours.

Big has a short vowel before its final g: bigger.

Today is hotter than Monday.

Today is hotter than Monday.

Hot → hotter, with a double t.

Two-syllable words ending in -y

When a two-syllable adjective ends in a consonant + y, change y to i before -er: happy → happier, easy → easier, busy → busier, noisy → noisier.

The combination happi-er is written happier. Do not write happyer, happyr or more happier; in this course, use the single form with a suffix.

How to build it

Final consonant letter + y → change y to i and add -er

This task is easier than the last one.

This task is easier than the last one.

Easy becomes easier: before -er, change the final y following a consonant to i.

The station is busier in the morning.

The station is busier in the morning.

Busy → busier; the other state is clear from context.

Than and an understood comparison

When naming the second thing or person, we usually introduce it with than: The train is faster than the bus. A noun, pronoun or substitute one can follow: than me, than yours, than the blue one.

Than is not required after every comparative. If two options are already visible or have been mentioned: Which coat is cheaper? — The blue one is cheaper. A comparative can also precede a noun: We need a smaller box.

How to build it

Comparative + than + comparison target; or a comparative alone when the comparison is understood

The train is faster than the bus.

The train is faster than the bus.

The second means of transport is named after than.

We need a thinner cable.

We need a thinner cable.

The comparative precedes the noun; the previous cable is known from the situation.

Do not mix the two patterns

In an ordinary comparison, do not place more before a form that already ends in -er: smaller, not more smaller. For familiar short words, use taller, faster and cheaper.

Long adjectives and irregular forms follow other patterns: expensive → more expensive, good → better, bad → worse. Do not form these by mechanically adding -er.

How to build it

Choose one pattern: smaller or more expensive

This room is smaller than the kitchen.

This room is smaller than the kitchen.

Smaller already expresses the comparison, so an additional more is unnecessary.

This laptop is more expensive than that one.

This laptop is more expensive than that one.

This contrast shows the boundary: expensive follows the more rule, not this suffix rule.

How to check your own sentence

Ask four questions: does the adjective belong to the target group; is the spelling change correct; which item actually has more of the quality; and is the comparison target clear?

You can express a comparison in different ways. Check the meaning as well as the spelling: which item has more of the quality, and what is it compared with?

How to build it

Adjective type → spelling → direction of comparison → clear comparison target

adjective
—
A word describing what someone or something is like: happy, tired, interesting.

The lake route is shorter than the hill route, so let's take it.

The lake route is shorter than the hill route, so let's take it.

The fact supports a logical recommendation; it clearly refers to the lake route.

The old flat is cheaper, but the new flat is larger.

The old flat is cheaper, but the new flat is larger.

The two comparisons have different subjects: the old flat is cheaper, and the new one is larger.

Common mistakes

Incorrect:This desk is smalller than that one.

Correct:This desk is smaller than that one.

Add -er to small: smaller. Do not add a third l.

Incorrect:This desk is more smaller than that one.

Correct:This desk is smaller than that one.

Do not combine more with the already comparative form smaller.

Incorrect:Summer is hoter than spring.

Correct:Summer is hotter than spring.

Double the final t in hot before -er.

Incorrect:My room is biger than yours.

Correct:My room is bigger than yours.

Big → bigger, with two g letters.

Incorrect:This task is easyer than that one.

Correct:This task is easier than that one.

In easy, change y to i before -er.

Incorrect:This bridge is safeer than the old bridge.

Correct:This bridge is safer than the old bridge.

Safe already ends in e, so add only r.

Incorrect:The train is faster then the bus.

Correct:The train is faster than the bus.

Than introduces a comparison; then expresses a sequence in time.

Incorrect:The blue box smaller than the red box.

Correct:The blue box is smaller than the red box.

This sentence pattern needs be between the subject and the comparative.

Incorrect:This book is gooder than that one.

Correct:This book is better than that one.

Good has the irregular comparative better and does not follow the productive -er pattern.

Incorrect:This phone is expensiver than mine.

Correct:This phone is more expensive than mine.

Expensive is a long adjective; its comparative follows the related rule with more.

Incorrect:This bag is the lightest than that one.

Correct:This bag is lighter than that one.

To explicitly compare one item with another using than, use the comparative lighter, not the superlative the lightest.

Incorrect:The 12 kg suitcase is lighter than the 9 kg suitcase.

Correct:The 9 kg suitcase is lighter than the 12 kg suitcase.

The form is grammatical, but the direction contradicts the stated facts.

Sources

More + long adjective: how to compare

What comparison with more means

The comparative form shows that an object, state, or experience has a quality to a greater degree. We place more before the adjective: more comfortable — more comfortable.

The subject determines the direction: in The train is more comfortable than the bus, the train has the higher level of comfort. Even a grammatically correct form is wrong if it reverses the visible facts.

How to build it

X + be + more + adjective + than + Y

adjective
—
A word describing what someone or something is like: happy, tired, interesting.

The train is more comfortable than the bus.

The train is more comfortable than the bus.

Train is the first participant and has more of the quality.

This route is more dangerous after dark.

This route is more dangerous after dark.

The second state is clear from the context, so there is no than phrase.

Which adjectives reliably take more

For this rule, use common words such as interesting, expensive, difficult, dangerous, comfortable, important, convenient, reliable. They usually form the comparative with more. Careful, useful, peaceful, and powerful work the same way.

The number of syllables is a guideline, not an exception-free rule. Happy → happier, while some two-syllable adjectives allow both patterns: cleverer / more clever. Check a new word in a dictionary when necessary.

How to build it

Long adjectives usually: more + base form

V1 / base form
—
The base verb without to: work, go, be.

The second explanation is more useful than the first.

The second explanation is more useful than the first.

Useful ends in -ful and reliably forms the comparative with more.

The documentary was more interesting than the lecture.

The documentary was more interesting than the lecture.

Interesting is a long adjective; in the usual pattern, we say more interesting.

More does not change the adjective’s form

After more, use the base form of the adjective: more expensive, more careful, more reliable. Do not add -er, change the ending, or use another more.

After be, use more + adjective: The plan is more practical. The same group can follow seem, become, look, or feel, which link the subject to a characteristic.

How to build it

more + base form of the adjective, without an additional -er

V1 / base form
—
The base verb without to: work, go, be.
adjective
—
A word describing what someone or something is like: happy, tired, interesting.

This plan seems more practical.

This plan seems more practical.

Practical remains in the base form after more.

The new system is more reliable than the old one.

The new system is more reliable than the old one.

Not reliabler and not more reliabler.

Than and the understood second participant

Than introduces what we are comparing with: more useful than the old guide, more expensive than mine. After than, we can use a noun with dependent words, a pronoun, or a clause: more useful than I expected.

Than is not needed after every form with more. If two options have already been named or are visible, it is natural to ask Which option is more practical? and answer The online option is more practical.

How to build it

more + adjective (+ than + what we are comparing with)

adjective
—
A word describing what someone or something is like: happy, tired, interesting.

The digital map is more detailed than the paper map.

The digital map is more detailed than the paper map.

Than directly connects two types of map.

Which chair is more comfortable?

Which chair is more comfortable?

Both chairs are known, so the second one is not repeated.

Questions and negatives

In a yes/no question, be moves before the subject: Is this room more comfortable? To ask for specific information, add a question word: Which route is more convenient?

To make a negative, put not after be: The basic plan is not more expensive than the standard plan. This form denies that one option has more of the quality, but by itself it does not prove that the two options are equal.

How to build it

Be + X + more + adjective? / X + be + not + more + adjective

adjective
—
A word describing what someone or something is like: happy, tired, interesting.

Is the morning flight more convenient than the evening flight?

Is the morning flight more convenient than the evening flight?

Is comes before the subject morning flight.

The new ticket is not more expensive than the old one.

The new ticket is not more expensive than the old one.

Not comes before the comparative group more expensive.

The comparative form before a noun

More + adjective can come before a noun: a more reliable service. An article or another determiner, such as this, comes before the entire group.

In this construction, the than phrase is often unnecessary if the previous option is known: We need a more practical solution. It still has a comparative meaning, rather than being simply more about quantity.

How to build it

a/an/the + more + adjective + noun

noun
—
A word naming a person, thing or idea: student, book, happiness.
adjective
—
A word describing what someone or something is like: happy, tired, interesting.

We need a more detailed map.

We need a more detailed map.

A comes before more detailed map.

They chose the more affordable option.

They chose the more affordable option.

The determines option, while more affordable describes it.

Do not mix neighboring mechanisms

Expensive → more expensive. Short adjectives often take -er: small → smaller. Good, bad, and far have the special forms better, worse, and farther/further.

Most + adjective forms the superlative: the most dangerous — the most dangerous. For a direct comparison with than in this pattern, use more: This route is more dangerous than that one.

How to build it

Choose the pattern: -er / more + adjective / special form

adjective
—
A word describing what someone or something is like: happy, tired, interesting.

The blue sofa is more comfortable than the grey sofa.

The blue sofa is more comfortable than the grey sofa.

One mechanism: more + comfortable.

This bag is lighter, but that suitcase is more durable.

This bag is lighter, but that suitcase is more durable.

Lighter and more durable show two ways of forming the comparative.

How to check your own comparison

Check the word, its form, and its meaning: does the adjective combine with more, has the base form been kept, and is it clear who has more of the quality and what it is being compared with?

Your own comparison may sound different from the example. What matters is that it expresses your meaning accurately.

How to build it

Type of adjective → form → word order → meaning of the comparison

adjective
—
A word describing what someone or something is like: happy, tired, interesting.

Plan B is more flexible than Plan A, so it suits my schedule better.

Plan B is more flexible than Plan A, so it suits my schedule better.

The comparison directly supports the conclusion.

The cheaper hotel is less convenient, but the other hotel is more comfortable.

The cheaper hotel is less convenient, but the other hotel is more comfortable.

The referents and the different criteria remain clear.

Common mistakes

Incorrect:This ticket is expensiver than that one.

Correct:This ticket is more expensive than that one.

Expensive has three syllables and forms the comparative with more.

Incorrect:The second book is interestinger than the first.

Correct:The second book is more interesting than the first.

Do not add -er to interesting.

Incorrect:This chair is more comfortabler than that one.

Correct:This chair is more comfortable than that one.

Double marking with more + -er is not allowed.

Incorrect:This road is most dangerous than the other road.

Correct:This road is more dangerous than the other road.

In a comparison with than, use more dangerous; most forms a different construction—the superlative.

Incorrect:The new guide is more useful then the old guide.

Correct:The new guide is more useful than the old guide.

Than introduces the second participant in the comparison; then refers to time.

Incorrect:The online class more convenient than the evening class.

Correct:The online class is more convenient than the evening class.

In the basic structure, be is needed between the subject and the comparative form.

Incorrect:The report is more more detailed than the summary.

Correct:The report is more detailed than the summary.

Use more only once.

Incorrect:We need more a reliable plan.

Correct:We need a more reliable plan.

The article comes before the entire group more reliable plan.

Incorrect:Is more practical this option than the first one?

Correct:Is this option more practical than the first one?

In a question, be comes before the subject, and the comparative form comes after the subject.

Incorrect:This exercise is more easier than the last one.

Correct:This exercise is easier than the last one.

Easier already means “more easy,” so do not add more.

Incorrect:This solution is more good than the old solution.

Correct:This solution is better than the old solution.

Good has the special comparative form better.

Incorrect:This chair is comfortable more than that one.

Correct:This chair is more comfortable than that one.

Put more before the adjective comfortable.

Sources

Irregular comparative forms: good → better, bad → worse, far → farther/further

Why we learn these forms separately

Many adjectives use -er or more, but good, bad, and far have special comparative forms. It is easier to remember them in pairs: good — better, bad — worse, far — farther/further.

Better is also the comparative form of well (“well”, “healthy”), while worse is the comparative form of badly (“badly”). Therefore, in works better and feels better, the same form can have a different role.

This soup is better than the one I had yesterday.

This soup is better than the one I had yesterday.

good → better; the spelling of this form is not related to the word good.

The traffic today is worse than usual.

The traffic today is worse than usual.

bad → worse; it also has a separate root.

Three pairs to memorize

In this lesson, we focus on three pairs: good → better, bad → worse, far → farther/further. This is not a complete list of all the special features of comparison in English.

The form comes after the linking verb (be) or another verb of state (feel, look, sound, taste, get), just like a regular comparative: subject + verb + better/worse/farther/further + (than + the second participant).

How to build it

X + be/feel/look/sound/get + better/worse/farther/further + (than + Y)

My back feels worse this morning.

My back feels worse this morning.

bad → worse; the comparison appears without an explicit than—the reference point (yesterday/earlier) is clear from the context.

The nearest hospital is further than I expected.

The nearest hospital is further than I expected.

far → further; the comparison is with an expectation, not with another specific object.

Her cooking has got a lot better since she started taking lessons.

Her cooking has got a lot better since she started taking lessons.

good → better; get better describes a change over time.

Why not -er or more

For an ordinary comparison of quality, use better and worse: This phone is better; the weather is worse. Do not form these words mechanically as gooder or badder.

More good or more bad are possible in other constructions, for example more good than bad—“more good than evil.” This is a different pattern, not an ordinary comparison of two things by quality.

For distance, use farther or further, not farer.

Better and worse already express the comparative degree. In a neutral standard comparison, more better and more worse are unnecessary; for emphasis, say much better or much worse.

This hotel is better than the last one, not more better.

This hotel is better than the last one, not “more better”.

better already expresses the comparative degree; there is no need to add more.

The line moved faster today, but it was still worse than I hoped.

The line moved faster today, but it was still worse than I hoped.

In this ordinary comparison with an expectation, we use worse.

Farther or further

Both words are comparative forms of far, and they are interchangeable for physical distance: The office is further from the station and The office is farther from the station are equally correct.

Further is also used to mean “additional”: further information—additional information. Farther is not used in this meaning. Could you explain this further? means “Could you explain this in more detail?”.

Practical tip: for physical distance, both forms are possible. For the meaning “additional”, use further: further information. There is no need to impose a broader ban on all figurative uses of farther.

The office is further from the station than I thought.

The office is further from the station than I thought.

physical distance—both further and farther are natural here.

We need further details before we can confirm the booking.

We need further details before we can confirm the booking.

the meaning “additional”—only further works here, not farther.

Comparison without an explicit than

Better, worse, farther, and further can appear without than when it is clear to the listener what the comparison is with.

I feel better—“I feel better”—often compares the present state with an earlier one. It is not necessary to say exactly what it is better than.

How are you? — Better, thanks.

How are you? — Better, thanks.

The comparison with the previous state is clear from the situation.

The forecast looks worse for tomorrow.

The forecast looks worse for tomorrow.

The context should make it clear whether tomorrow’s forecast is being compared with today’s forecast or with an earlier forecast for tomorrow.

In a sentence: negatives, questions, and short answers

The comparative forms themselves do not change in questions or negative sentences. With be: Is it better? / It isn’t better. With feel in the Present Simple, do/does is needed: Does it feel better? / It doesn’t feel better.

A short answer repeats only the auxiliary verb, without repeating better/worse/farther/further: Is it worse today? — Yes, it is. / No, it isn't.

How to build it

Is/Was + X + better/worse + (than Y)? — Yes, it is. / No, it isn't.

This translation isn't worse than the last one.

This translation isn't worse than the last one.

the negative is formed with isn't; worse does not change.

Is the traffic better on Sundays?

Is the traffic better on Sundays?

the question is formed through inversion with is; better stays in place.

Common traps: when automatic habits let you down

The ending -er and the word more are regular patterns for other adjectives: heavy → heavier, expensive → more expensive. Do not transfer them automatically to good, bad, or far.

Compare: This bag is heavier than that one (regular, -er, the word heavy) and This bag is better than that one (irregular, a separate word, good)—both sentences are correct, but they describe different qualities using different mechanisms.

This bag is heavier than that one, but it's better made.

This bag is heavier than that one, but it's better made.

Heavier is formed from heavy; better made means “made better” and has the adverbial meaning of well.

The new laptop is more expensive but works better than the old one.

The new laptop is more expensive but works better than the old one.

More expensive describes the laptop, while works better describes how it works; better here is the comparative form of well.

Using them in speech

These forms help you talk about how you feel, quality, weather, distance, and change. Choose the one that accurately expresses the quality you need.

The aim of this material is not only to recognize a form in someone else’s sentence, but also to use it freely by creating your own advice, complaints, praise, and accounts of real or imagined changes.

I think this plan is better than the one we discussed last week.

I think this plan is better than the one we discussed last week.

a personal evaluation in a work context.

My flight leaves from a terminal that's further from the entrance.

My flight leaves from a terminal that's further from the entrance.

a practical everyday use of distance.

Common mistakes

Incorrect:This soup is gooder than the one I had yesterday.

Correct:This soup is better than the one I had yesterday.

good does not form its comparative with -er; its comparative is the separate word better.

Incorrect:My new phone is more good than my old one.

Correct:My new phone is better than my old one.

For an ordinary comparison of the quality of two phones, use better.

Incorrect:The traffic today is badder than yesterday.

Correct:The traffic today is worse than yesterday.

bad, like good, does not form an -er form; its comparative is the separate word worse.

Incorrect:Her results were more bad than last term's.

Correct:Her results were worse than last term's.

The form needed in an ordinary comparison of results is worse.

Incorrect:This hotel is more better than the last one.

Correct:This hotel is better than the last one.

In a standard comparison, better already means “better”, so more is unnecessary. For emphasis, you can say much better.

Incorrect:The station is farer from here than the airport.

Correct:The station is further from here than the airport.

far does not take -er; its comparative is the separate form farther/further (both are acceptable here).

Sources

More and less after a verb

What we compare: an action rather than an object

In I sleep more now or She worries less than before, more and less do not compare two objects or two qualities. They describe how much, how often or to what degree the verb’s action occurs. Here more/less functions as a comparative adverb modifying the verb.

This differs from the familiar pattern more + longer adjective (more expensive, more interesting), where more describes a quality, often after be. In sleeps more, the key word is verb sleep: we compare amounts of sleeping rather than separate objects or people.

Compare the positions: sleep more describes doing more sleeping; more sleep describes a greater amount of sleep. In the first phrase sleep is a verb; in the second it is a noun.

Since he started the new job, Tom sleeps more than he used to.

Since he started the new job, Tom sleeps more than he used to.

More compares the action sleep, or how much Tom sleeps, rather than an object.

She worries less than her sister.

She worries less than her sister.

Less modifies worries: the comparison concerns two people’s degree of worrying rather than their qualities.

Usual position after the verb

In neutral word order, more/less follows the verb. With a direct object (helps the team) or a verb particle (gives up), put more/less after that group rather than splitting it: helps the team more, gives up less. A following prepositional phrase can remain later, as in complains less about the schedule.

The same pattern applies to both words. More signals an increase and less a decrease, but their usual position is the same.

How to build it

Subject + verb (+ direct object or particle) + more/less (+ than + comparison).

subject / S
—
The grammatical subject: who or what the clause is about; the verb agrees with it. In The book was written, the book is the subject, although someone else does the action.
verb / V
—
A word for an action or state, such as work or be. The pattern determines its form.
object / O
—
Who or what an action affects: in I read a book, a book is the object.

Experience helps more than expensive equipment.

Experience helps more than expensive equipment.

More follows helps and precedes than, rather than more helps.

He gives up less than he used to.

He gives up less than he used to.

Less follows the whole phrase gives up rather than splitting it into gives less up.

The new manager helps the team more than the last one did.

The new manager helps the team more than the last one did.

Object the team goes between the verb and more: helps the team more rather than helps more the team.

Than introduces the comparison

Than names what something is compared with. It can be followed by a noun (than money), an adverb (than before) or a clause (than she used to).

When the comparison point is understood, than is optional: I sleep more now. If you name it explicitly, introduce it: Kindness matters more than money.

Kindness matters more than money.

Kindness matters more than money.

Than + noun phrase money.

He worries less than he did last year.

He worries less than he did last year.

Than + full clause he did last year.

Less follows the same pattern as more

Learners sometimes practise only more and overlook that less follows the same position pattern: after the verb, before than. There is no separate pattern for less.

Build pairs with the same verb and opposite directions to see that the position stays the same; only the word expressing the direction changes.

We travel more than we used to.

We travel more than we used to.

More immediately follows travel.

We complain less than we used to.

We complain less than we used to.

The same structure: less occupies the position that more has in the previous sentence.

The key contrast: action versus quality

The same idea can often be expressed with a verb (he worries more) or an adjective after be (he is more worried). Both are grammatical and close in meaning, but use different constructions.

Problems arise when the two are mixed: using be for an action while treating verb worry as though it were an adjective produces is more worry. First decide whether the main meaning is carried by a verb or adjective, then place more/less accordingly.

He worries less than before.

He worries less than before.

Action: verb worry + less immediately after it.

He is less worried than before.

He is less worried than before.

Quality: be + less + adjective worried. Both sentences are correct, using different constructions.

Another related pattern: more/less before a noun

More/less can directly precede a noun to express quantity (more time, less money). They then function as determiners modifying nouns rather than adverbs modifying verbs. This is a different grammatical role and pattern.

Compare sleeps more, which measures the action sleep, with needs more sleep, which measures noun sleep. The words look the same, but their positions and roles differ.

She sleeps more than she used to.

She sleeps more than she used to.

More follows verb sleeps, comparing the amount of the action.

She needs more sleep than she used to get.

She needs more sleep than she used to get.

More precedes noun sleep, comparing a quantity. This is outside the target construction.

Negatives and questions

In a negative, auxiliary don’t/doesn’t/didn’t precedes the main verb as usual. More/less retains its usual position after the main verb, or after its direct object or particle if present.

In a question, put Do/Does/Did before the subject and use the verb’s base form after the subject: Does she sleep more? More/less keeps its normal position after the verb.

She doesn't complain more than she used to — if anything, she complains less.

She doesn't complain more than she used to — if anything, she complains less.

Doesn’t precedes complain; more/less follows complain as in an affirmative statement.

Do you sleep more now than you did as a student?

Do you sleep more now than you did as a student?

Do moves to the front; sleep more keeps its usual order.

Using the pattern in conversation

This is a natural way to discuss changes in habits, relationships, work or wellbeing. It is common in everyday conversation: I work more now; We argue less than we used to.

The aim is to describe a real or imagined change freely rather than reproduce a memorised example. Choose your own verb, topic (health, work or relationships) and way to establish the before-and-after comparison.

I've read a lot more since I started commuting by train.

I've read a lot more since I started commuting by train.

A personal situation provides a natural reason for comparison: since I started… .

He trusts new colleagues less after what happened last year.

He trusts new colleagues less after what happened last year.

Less follows trusts new colleagues: the verb and its object precede less.

Common mistakes

Incorrect:I more sleep now than I did last year.

Correct:I sleep more now than I did last year.

More is a comparative adverb modifying sleep; in this neutral sentence it follows the verb rather than preceding it.

Incorrect:She less complains about the schedule than she used to.

Correct:She complains less about the schedule than she used to.

The same principle applies to less: place it after complains rather than before it.

Incorrect:Passion matters more expensive tools.

Correct:Passion matters more than expensive tools.

Than is needed to introduce the explicitly stated comparison here. Without it, expensive tools is not linked to the comparison and the sentence becomes unclear.

Incorrect:We travel more, we used to.

Correct:We travel more than we used to.

Than links the main clause to the comparison clause; a comma alone cannot do that job.

Incorrect:He is more worry than before.

Correct:He worries more than before.

Worry is a verb here, rather than an adjective after be. Attach more to the verb (worries more) instead of inserting it after be.

Incorrect:He give up less often now.

Correct:He gives up less often now.

Present simple with he requires gives. Less often expresses lower frequency and follows gives up.

Sources
Practise with Vocairo