Have to and Don't have to

In a present positive statement, use have to with I, you, we and they. With he, she and it, use has to. The name or description of one person also needs has to.

Look at who must perform the action, rather than the nearest word. My neighbours means several neighbours; my neighbour means one. Everyone is grammatically singular.

The construction has three parts: have/has + to + base verb. Do not lose or duplicate to. Do not add -s or -ing after it.

Have changes to has, while the next verb keeps its base form: has to work, has to go, has to be. Have to is not ordinary have meaning possession of a thing.

Have to often presents an obligation as an external requirement. Must can emphasise the speaker’s or rule-maker’s position. This is a tendency, rather than a strict division between external and internal obligation.

Both constructions can express the same obligation. If an exercise specifically requests have to, must may miss the learning requirement but does not become grammatically incorrect in itself. Need to can also express necessity and changes like an ordinary verb: she needs to.

Have to states that an action is necessary. Don’t have to / doesn’t have to means the action is not compulsory. It is not a prohibition.

Mustn’t expresses a prohibition. Do not change have to to mustn’t if you only want to remove the obligation. After doesn’t, have returns because does already expresses the third-person form.

To check whether an obligation exists, an ordinary yes/no question with have to uses do or does. After does, write have, rather than has. When asking about time, when comes before do/does. If who is itself the subject, no separate do/does is needed: Who has to bring the keys?

This lesson focuses on present requirements. Questions and negatives support a short conversation and contrast; past obligations with had to and detailed question patterns are studied separately.

Identify who must act, name the action and add an external reason if needed: a course requirement, work schedule or broken lift, for example. Not every sentence of the message needs have to.

You can invent circumstances in your own answers. The model is one way to express the idea; other natural words and clause orders are possible if the meaning and explicitly requested construction are preserved.

With I, you, we, they, and plural subjects, we use don't have to. With he, she, it, and one thing or one person, we use doesn't have to.

The full forms do not have to and does not have to are also correct. After doesn't, we need have, not has: does already carries the third-person singular marker.

After the negative, we need the complete construction have to, followed by the base form of the verb: go, pay, wait, be. Do not add -s or -ing.

Do not leave out to: have to works differently from must. In doesn't have to work, work is the verb that names the action that is not required.

Have to or must can express an obligation. In many contexts, their meanings overlap; this is not a strict division between an external rule and a personal rule.

But the negative forms are different: don't have to means that doing something is not required; mustn't / must not means that doing something is prohibited. Both sentences can be grammatically correct, but they communicate different requirements.

To check whether an action is required, ask Do / Does + subject + have to + verb? In the question, we also keep have after does.

A short answer such as No, you don't or No, she doesn't denies the necessity. You can answer with a full sentence and explain why there is no requirement.

Don't have to does not say whether the person will do the action. They may choose to do something that is not required. We talk about wishes or decisions separately.

The absence of one requirement does not cancel others: “you do not have to register” does not guarantee an available place or the right to break the remaining rules.

In conversation, this construction helps reduce pressure: it can avoid requiring help, an immediate reply, or participation. A friendly explanation clarifies the intention. Here we practise present requirements; past constructions and needn't are separate topics.

In an ordinary direct present simple question, put do before I, you, we, they or a plural subject. For he, she, it or one named person, use does.

Have to follows the subject. Does already carries the third-person marking: She has to pay → Does she have to pay? Do not put has after does.

After to, use the base form of the action: pay, wait, bring, be. In Do I have to be there?, be expresses the required state after have to, so the question still begins with Do, not Am.

After when, where, why, what time and how much, keep the familiar order: question word → do/does → subject → have to → action. When do we have to leave? focuses on the time of a necessary departure, rather than asking a simple yes/no question.

What do you have to do? contains two instances of do with different roles. The first helps form the question; the second is the main verb naming the action. Do not remove the final do merely because it is repeated.

Compare Someone has to close the door → Who has to close the door? Who replaces the unknown person. It is itself the subject, so this neutral question does not add do or does.

In Who do you have to call?, the performer is known: you. The unknown person is the one you must call, so do is needed. The role of who determines the pattern, not the word alone.

At this level, we practise neutral Who has to…? to identify an unknown performer. Stressed Who DOES have to…? is also possible when asking with special emphasis, but it is not the basic pattern here.

Do you have to…? can be answered with Yes, I do. or No, I don’t. Does he have to…? takes Yes, he does. or No, he doesn’t. The pronoun depends on who is answering: the other person asks you, while you speak as I.

No, I don’t means there is no obligation. It does not state a prohibition or promise that you will not do the action. Add an explanation if useful: It’s optional.

Yes, I do. and No, I don’t. are convenient practice patterns, not the only possible replies. The full answer No, I don’t have to pay. and No. alone can also be appropriate in real conversation.

Do you have to leave? is a widely used way to ask about necessity. Have you got to leave? is another acceptable construction. The rarer, somewhat old-fashioned British Have you to leave? also occurs. Do not confuse it with the genuinely incorrect Has she have to leave?

You have to leave? can naturally check something just heard or express surprise. It is not the neutral question built with the Do/Does pattern here. When an exercise asks for that pattern, a correct echo question may not meet its learning aim.

Must I leave? is grammatical. Neutral everyday questions more often use Do I have to leave? This lesson practises have to rather than every way of expressing necessity.

First identify the missing information: whether the action is compulsory, where or when to do it, or who should do it. Then identify the subject and build the question. In an answer, check both the form and whether it actually supplies the requested detail.

The present simple with have to can also describe an established requirement for tomorrow: Does he have to work tomorrow? Tomorrow alone does not require will. Past obligations with Did…have to and separate future constructions are outside this lesson’s practice.

A useful check: for a known subject, choose do or does; use have to after the subject; put the base form after to; and make sure the question matches your purpose. When who is the subject, check the separate Who has to…? pattern.