Have to, must, should, ought to.

You __ use your phone in quiet zones.

• don't have to

• mustn't

• should

Do you think we __ text Dad to tell him we'll be late?

• ought to

• mustn't

• ought not to

You __ send text messages when you are driving.

• mustn't

• don't have to

• ought to

I __ phone my friend! It's his birthday today.

• have to

• must

• ought not to

You ___ pay. This museum is for free.

• mustn't

• don't have to

• ought to

You can slow down. We have plenty of time. We __ hurry.

• mustn't

• don't have to

Passangers __ switch off their phones on a plane.

• have to

• ought to

• shouldn't

I always __ stand on a bus. There are lots of people.

• have to

• should

• ought to

You __ swim here. It's forbidden.

• must

• mustn't

• don't have to

You ___ wear a sun hat when it's very hot and sunny.

• ought to

• don't have to

• shouldn't