must, have to and should

We´re not allowed to text our friends in lessons.

We ... text our friends in lessons.

It's a good idea to read through your work before you show it to anyone.

You ... read through your work before you show it to anyone.

My brother can wear any clothes he likes to school.

He ... wear a school uniform.

Can you advise me which phone to buy?

Which phone ... I buy?

It wasn't necessary to book seats for the concert.

We didn't ... book seats for the concets.

It isn't very sensible to wear your best shirt when you mend your bike.

You ... wear your best shirt when you mend your bike.

Seat belts are compulsory for both drivers and passengers.

Both drivers and passengers ... wear seat belts

Johnny left basketball class early last week – he ............ do his homework.

• had to

• must

• didn't have to

When you see your brother, you ................ tell him about his secret birthday party!

• don't have to

• must

• mustn't

When the film starts, you ................. be quiet.

• don't have to

• had to

• must