couldn't don't have to needn't的区别
couldn't don't have to needn't的区别
能否解释一下musn't,needn't ,don't have to,can't ,couldn't的区别?
needn't needn't have done 和don't need to 的区别
英语语法don't have to 与 don't need to的区别和用法don't need to和 needn'
don't need,needn't 的区别
"don't need to" 与 "don't have to"、"needn't" 的意义相同吗
请教needn't have ,don't have to是什么意思?
Needn't have done 和needn't do的区别!
needn't和don't need to有什么区别?haven't和 don't have 有
请问英语中couldn't wouldn't needn't mustn't的区别与用法?
have to,must,do not need,needn't的区别
can,can't,must,mustn't,needn't,be allowed to,have to,don't h