We use must to talk about things that we have to do.

• I must mail this mail today.

• Children mustn't play with matches.

• Why must I go to bed now?

• Must keeps the same form in the past tense.

• The contraction of must not is mustn't

Complete the sentences using must or mustn't with a verb from the box bellow.

Go eat stop believe tell

Steal be read park listen

• You __________ at the curb and look before you cross the street.

• Children _________ to the teacher if they want to learn.

• You _________ everything people tell you.

• You __________ the question carefully before you write the answer.

• If you want to be healthy, you ______ a lot of vegetables.

• You _______ out on your own at night.

• We ________ because it is wrong.

• Drivers __________ their cars in the middle of the road.

• If you want people to be nice to you, _______ nasty to them.

• You _________ always ________ the truth.

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