The students mustn't/ needn't bring their books today because they are going to visit the museum.
People mustn't/needn't throw litter on the floor.
We mustn't/needn't shout at each other when we are discussing something. It is very rude.
Jack mustn't/needn't buy another car because he has got three already.
You mustn't/needn't go near that dog. It might bite you.
We mustn't/needn't buy that book. Peter has got the
same book, so he can lend it to us.
I have got plenty of time. I mustn't/ needn't hurry.
Smith gave me letter to post. I mustn't/ needn't forget to post it.
This book is very valuable. You mustn't/ needn't lose it.
It's snowing. You mustn't/ needn't put on your shorts.
You mustn't/needn't cheat at the exams.
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