Expressing Necessity: Must, have to, Have got to
| You must come at once. (extremely important) All applicants have to take an entrance? | Have to is used more commonly. Must is usually stronger than have to and can indicate urgency. |
| I have got to go now. | Have got to is informal. Usual pronounce of got to is “gotta”. |
| Present or Future I have to/have got to/must study tonight. Past I had to study last night. | The idea of past necessity is expressed by had to. There is no other past form for must or have got to. |
Lack of Necessity and Prohibition Have to and Must in the negative
| Lack of Necessity ( Do not Have to) Tomorrow is a holiday. We don’t have to to class. | Do not have to: it is not necessary for us to go to class. |
| Prohibition (Must not) You must not look in the closet. You birthday present is hidden there. You must not smoke in the class. (must not = prohibition) | Must not: DO NOT DO THIS. Do not look in the closet i forbit it. The negative form: Mustn’t |
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