Questions with have to: is it necessary, what is needed and who must act?

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.