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Ex. 1. Write must or mustn't and the appropriate expressions: tell anybody, do his homework every day, put on your coat, get up so late, be very careful. 1) She is taking her little children to the zoo. She_
2) It is very cold. You_
3) She is always late for work. She_
4) it's a secret. You_
5) He has a lot of bad marks at school. He_

Ex. 2. Fill in must or can.
1) Sonia_practise so much if she wants to take part in the competition.
2) We_stay with my brother when we are in Paris.
3) It is already six o'clock. We_hurry if we don't want to be late.
4) You_find any kind of information on the Internet. 5) You_put posters in the room. It's allowed.

Ex. 3. Find mistakes.
1) He musts take his dog for a walk.
2) I can to help you.
3) He not must be late.
4) Can his brother speaks French?
5) You don't must smoke here.