cannot can't couldn't mustn't的问题1.cannot = mustn't 是不准?那can't呢?2.can是不能够,may是不可能 对不?3.cannot can't couldn't之间的不同

cannot can't couldn't mustn't的问题1.cannot = mustn't 是不准?那can't呢?2.can是不能够,may是不可能 对不?3.cannot can't couldn't之间的不同 can’t / couldn’t have cannot等于can't吗? 1.I am sorry that I couldn't call you ealier.(couldn't 可以用cannot 代替吗）2.You can install windows frames which could make...can可以用could代替吗could可以用can代替吗 can not=cannot=can't ? couldn't与can't的区别! can't与couldn't的区别 can't和couldn't区别? can't与cannot的区别是什么? cannot和can't用法的区别 cannot 和 can't 的区别 cannot 和can't的区别 can't =cannot 的用法 can't 和cannot有什么不同 cann't,cannot,can't,can not有什么区别 can't是cannot 还是can not don't呢? without your help and support,i ( )so much ,i cannot thank you too mucha,can't achieve b,couldn't achieve c,wouldn'thave achieve d,needn't have achieve can`t cannot can not有没有区别