Needn't have done 和needn't do的区别!

Needn't have done 和needn't do的区别! needn't needn't have done 和don't need to 的区别 区别shouldn't have done 和 needn't have done didn't need to do 与needn't have done 的区别和相同点 Didn't need to do还有 needn't have done的区别 needn't have done用法 needn't have done与shouldn't have done的区别? have to,must,do not need,needn't的区别 needn't have done和didn't need to do 有什么不同? mustn`t 和needn`t的区别 needn't和cann't的区别 needn't have done还是didn't have done