Question

mustn't和needn't有什么区别？

Answer 1

needn't的意思是"不必要",而mustn't的意思是"禁止".如果问句是以must开头的,肯定回答为"yes,you
must."否定回答为＂no,you
needn't＂.两者在意思上有本质的区别．注意分清哦！

Answer 2

mustn't
语气强，”禁止”;千万不要的意思
例如:You
mustn't
step
on
the
grass.
needn't
表示不必这么做：常做must问句的回答：Must
I
finish
my
homework
today?
No,
you
needn't.