You must wear a seatbelt. They must

Passengers must not lean on the doors.

It’s possible to make questions with ‘must’ but it’s not very common in modern English. To make the question form we invert the subject and ‘must’:



Here are some examples:

Must I go to the party? I don’t really want to.

What time must we leave? Not later than 2pm.

Must he make so much noise? It’s really annoying.

Why must the children do so much homework?

What must you wear at work?

Who must we call for an appointment?

Have to

In the affirmative form, ‘have to’ has the same meaning as ‘must’ and is used to express obligations. However, ‘have to’ is much more flexible than ‘must’ because we can use it in the past, the present and the future. For this reason it is very commonly used in modern English. Its structure is the same as any normal verb:



Here are some examples of affirmative sentences:



I have to email the supplier before he sends the goods.

We have to do the shopping because the cupboards are empty.

She has to take two trains and a bus to get to work every day.

You have to practice if you want to be fluent.