Must or Mustn`t

You _______ pay attention at school.

You _______ be quiet in the library.

You _______ run across the road.

We _______ shout in class.

She _______ help her brother with his homework.

You _______ look after your pets.

We _______ make a mess when we paint!

He _______ keep his bedroom tidy.

Peter is sick and in the hospital. Doctor tells him:

He _______ go to work for a week

Swimming pool rules:

Non-swimmers _______ wear lifejackets