a We mustn’t use our phones at all during school hours. b We couldn’t use our phones at all during school hours., a The girls couldn’t wear trousers to school. b The girls didn’t have to wear trousers to school., a The older students don’t have to attend all their classes. .b The older students needn’t attend all their classes., a You didn’t need to write a 2,000-word essay this time. b You needn’t have written a 2,000-word essay this time., a If we’re late three times in succession, we have to see the head teacher. b If we’re late three times in succession, we must see the head teacher., a We aren’t supposed to bring any mobile devices into the class. b We shouldn’t bring any mobile devices into the class..

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