求can't\mustn't\won't\needn't的用法这些词的用法怎么样啊?比如这题：Is jack on duty today?---It ___be him ;It's his turn tomorrow A.mustn't B .won't C.can't D.needn't
问题描述：
求can't\mustn't\won't\needn't的用法
这些词的用法怎么样啊?
比如这题：Is jack on duty today?
---It ___be him ;It's his turn tomorrow
A.mustn't B .won't C.can't D.needn't
答
mustn't 只能表禁止~~~~~这是中考的一个考点.
won't表不会发生···表推测~~~~~~
can't很多了~1,表能力,不会做···2,表推测,不可能（把握性为百分之百）3,表不允许···
needn't不需要```这里的need是情态动词
有一道中考题常考：甲：Must I finish my homework?
乙：No,you needn'd/don't need to/don't have to
切记：不能用mustn't~~~~~~~~