2 Complete the rules (a-d) from the video explanation with must/mustn't, don't have to or should/ shouldn't. Then match each rule with the correct sentence (1-4). a)We usefor prohibition
b)We use for advice or recommendation
c)We use...for obligations
d)We use...for no obligation.
1.Teachers must correct their students' work.
2 Teachers don't have to wear a uniform.
3 Teachers mustn't allow students to cheat in exams.
4 Teachers should arrive at school on time. They shouldn't be late.
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