can / can't, must / mustn't, adverbs of manner and degree
3 Ann must / can't ride a bike because she's only three years old. 4 You must / mustn't play on the road. There are lots of cars. 5 It's very hot. You can / ...
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3 Ann must / can't ride a bike because she's only three years old. 4 You must / mustn't play on the road. There are lots of cars. 5 It's very hot. You can / ...
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