Mixed Modals of Obligation & Deduction

You ___________ (don't have to / mustn't) hurry. You have plenty of time before your flight.

Emma hasn't visited Ashley yet. She _________ (mustn't / hasn't to) know she is in hospital.

You _________ (don't have to / mustn't) use the internet when you are on the plane.

You _________ (have to / should) wear a seatbelt when driving.

Complete the rule. Use HAVE TO for …...............

We _________ (don't have to / mustn't) book the train tickets in advance. We can buy them at the station.

He _________ (doesn't have to / mustn't) eat any milk products. He is allergic to milk.

OUGHT TO is another way of saying SHOULD.

When you get sick, you ________ (should / must) drink a glass of hot water with honey and vinegar.

When I saw the doctor, he told me that I _________ (had to / must) take the medicine for 5 days.  It's very important.

Grammar Rule: It is possible to use CAN'T / NOT ALLOWED TO instead of mustn't.

He knows all the football players and match results. He _______ (must / should) watch a lot of football.

You ________ (don't have to / shouldn't) drink more than 3 cups of coffee a day.

In my country, you _________ (have to / should ) be 18 years old to drive a car.

Do you think we _________ (should / ought to) book a taxi for the airport?

I __________ (have got to / have to ) do my homework.

I lost my handbag at the café in the airport. It wasn't there when I went to find it. Someone _________ (must have taken / had to have taken) it.

His car is in front of his house. He _______ (must be / has to be) home.

The children ____________ (should / have to) wear a uniform to school.

In many situations, you can use both MUST or HAVE TO. For example: I must / have to study.

That bag is really nice! It __________ (must have been / had to have been) very expensive!

She ___________ (doesn't have to / mustn't) go to the party if she doesn't want to.

I _________ (mustn't / don't have to) do any homework today. The homework we have is for next Friday.

Grammar Rule: HAVE GOT TO means the same as HAVE TO.

Grammar Rule: Use ___________ ( don't have to / mustn't) to say that something is prohibited or not allowed.

You ___________ (mustn't / can't / don't have to) park here. It is not allowed.

If you want to learn English grammar, you ___________ (should / must) do some grammar exercises.

I'm getting fat. I _______ (must / have to) start going to the gym again.

Which modal verb below is stronger?

She ______ (has to / must) study for her exam tomorrow.

Grammar Rule: Use ___________ ( don't have to / mustn't) when there is no obligation or need to do something.

You _________ (don't have to / mustn't) use your telephone when driving.

Doctors and nurses _________ (have to / should) work at night sometimes.

He ____________ (mustn't / doesn't have to) wear a uniform to work.

Grammar Rule: HAVE GOT TO is less formal than HAVE TO.