Conjunctions

And expresses addition. It tells us that both elements or both events belong in the picture.

In a narrative, and can also connect successive actions. And alone does not prove that the first action caused the second: a causal interpretation depends on context.

But places ideas side by side when the speaker sees a difference or an unexpected combination between them.

Both clauses remain true. But does not deny the first idea; it adds a fact that limits expectations or changes the assessment.

Or presents alternatives: one of the options, different possibilities or a question offering a choice.

Tea and coffee names both drinks, while Would you like tea or coffee? usually invites a choice. Context determines whether the options may be combined: or does not always mean only one. You can add or both for clarity.

In this rule, so means therefore or as a result. The first clause names a cause or situation; the clause after so gives its result, a decision or a natural consequence.

Do not combine because and so for the same relationship in a standard sentence. Because introduces the cause, while so introduces the result: Because the bus was late, I walked or The bus was late, so I walked.

Other meanings of so, such as degree in so tired or purpose in so that, belong to other rules.

Coordinating and, but and or can join words, phrases or clauses of the same type. In this lesson, so connects a situation with a separate result clause.

Each full clause retains ordinary English word order. In a full alternative question, question order is needed again after or: Do you want tea, or do you want coffee?

Repeated words can be omitted when the meaning remains clear: Do you want tea or coffee? This is natural shortening, not an incomplete answer.

When a conjunction connects two full clauses with separate subjects, a comma often comes before it, especially to make the boundary clear. The comma goes before the conjunction, not after it.

When a conjunction joins individual words, short phrases or two actions sharing a subject, a comma is usually unnecessary. With short full clauses, writers have some choice, so the mere absence of a comma should not automatically be called a grammatical error.

British and American conventions also vary on commas before and in lists. This rule practises clear two-clause structure rather than banning regional conventions.

Before choosing a conjunction, briefly identify the relationship: another fact, a contrast, an option or a result. This helps you avoid choosing mechanically.

A real response can combine several relationships, but each must be clear. Two clear short sentences are better than a long chain without a logical connection.

Personal and invented examples are equally suitable for practice. Check meaning, the conjunction, the form of both clauses and naturalness separately.

A complete clause usually follows because: a subject and a verb. In I left because I felt tired, the words I felt tired explain why I left.

Do not confuse because with because of. A noun or noun phrase follows because of: because of the rain. In this lesson, we mainly practise because + a clause with a subject and a verb.

You can put the reason first for emphasis. Then place a comma after the initial because-clause.

When can mean at the time that: one event happens at a particular moment or against the background of another. In the past, a punctual form such as came or rang often sets the moment for another action.

When also introduces a repeated situation: When I work late, I take the bus. This is not about one evening; it is a usual response whenever that situation occurs.

In a time clause referring to the future, we usually use a present form after when, not will: Call me when the meeting ends. The full system of future and conditional sentences belongs to related lessons.

In its time-related meaning, while emphasizes that one action continues during another or that two actions happen at the same time. Past Continuous often makes the duration noticeable, but while does not automatically require two Continuous forms: Joe wrote emails while I cooked dinner is also possible if the speaker sees both actions as completed.

When can sometimes also mean during the time that, especially with Continuous forms. Therefore, a controlled exercise should provide context that specifically calls for emphasis on an extended overlap; without such context, both words may be natural.

While also contrasts two different features or choices: Nina likes quiet, while Oleg enjoys music. There are no simultaneous actions here; the meaning is close to whereas or contrastive but.

A because-, when-, or while-clause can come after the main clause. In neutral short sentences, we usually do not use a comma before it: We left because it was late.

If the dependent clause comes first, place a comma after it: When the shop opened, we went in. This order does not change the basic connection, but it can change the emphasis.

A dependent clause on its own is usually not a complete neutral written sentence. In dialogue, the short answer Because I was tired is natural after Why?, but connected writing requires a main clause.

The same facts can be connected in different ways, but the meaning will change. I went inside because it was raining gives a reason. When it started raining, I went inside names a moment. I listened to music while it was raining shows a time background.

Do not learn this rule as a word-for-word replacement for because, when, and while in another language. First identify what is the reason, what is the time reference, and what happens in parallel or contrasts.

In your own speech, add enough context. If both when and while are possible, choose while when you want to emphasize duration and overlap more clearly, and when when the important idea is a moment, sequence, or repeated situation.

The subordinate clause can come after or before the main clause. Because of this, the first part of the sentence does not necessarily describe the first event.

To reconstruct the chronology, find the conjunction and ask two questions: which event is named in the subordinate clause, and does the main action happen before or after it?

Without enough context, before and after can form two different grammatical sentences. Therefore, in an exercise with one answer key, the chronology is always stated clearly.

Until combines with an action or state that can continue: wait, stay, work, keep, be open. It sets the time boundary of this continuation. The instruction keep the door open until… does not necessarily order someone to close the door at that exact moment.

A common pattern with a negative main clause means that the change will not happen before the boundary: Don’t leave until I return. You need to stay for the entire time until I return.

Until does not mean “no later than the deadline.” For a completed one-time action by a certain time, by is usually needed; this is a related contrast, not the main focus of this rule.

In some languages, the endpoint event is often expressed with a negative marker. In English, in this meaning, until already expresses the boundary, so the subordinate clause is usually affirmative: until I come back.

There is no general ban on every kind of negative after until. The important point is not to copy a negative marker if it does not change the factual meaning. First identify the real event that ends the waiting or state.

In Don’t leave until I come back, the negative is needed for the action leave, while the return remains the positive endpoint event.

When before, after, or until introduces a time clause about the future, we usually use the Present Simple in that clause, not will. The future meaning is already clear from the whole construction.

The main clause can contain will, an imperative, or another suitable construction: I’ll call after she arrives; Wait until she arrives. In both cases, arrives refers to the future.

This rule concerns the form of the time clause, not prediction or conditionality. There is no need to put will in both clauses.

The clause with before or after can come at the beginning: Before you leave, check the window. In standard writing, we put a comma after such an initial subordinate clause. When it comes after the main clause, a comma is usually not needed.

The clause with until most often comes after the main clause, especially in short instructions and requests. An initial Until is possible, but less typical and not needed for basic A2 use.

Here we practise before, after, and until with a full “subject + verb” clause. Reduced constructions such as before leaving and initial Not until… are studied separately; they are also possible English patterns.