Поделитесь своими знаниями, ответьте на вопрос:
На ! write what you must/ mustn't/ have to/ need/ needn't do at school. add two sentences of your own. 1)we mustn't use our mobile phones in class. 2) do tests every day. 3) wear a uniform. study astronomy. study biology. 6) do homework everyday.
3) must
4) needn't
5) need
6) must