1) I ........swim in the swimming pool. a) can b) could 2) You.....clean your teeth every day. It is necessary. a) mustn't b) must 3) ....I go to the loo? a) Can b) May 4) When you go to school , you ......wear a school uniform. a) have to b) can 5) You ....go to bed before 12 a.m. a) can't b) must

Modal verbs

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