could和couldn't的不同

could和couldn't的不同 could和 must和 couldn't 的区别和用法? 求两组英语句型的解释could have done 和 couldn't have doneshould have done 和 shouldn't have done couldn't have done和couldn't do的区别 didn't 和couldn't的区别, couldn't have done与couldn't区别以及当could have done表示对过去的猜测时,could have done与could有什么区别? But I could ,couldn't?翻译 couldn`t的意思和时态 couldn t和 用can、can't、could、couldn't写一篇关于自己的短文 不少于60词 We couldn't watch until our homework was finished.为什么用couldn't 换成cann't 行不行 could 和 can 有什么区别? I couldn't bear it 和I couldn't bear this的区别 couldn't和shouldn't的区别,急要 Alice couldn't answer the question,could she?中间的答是什么 英语反问句问题couldn't keep from loving a man like that,could you 这句话对吗?最后反问时是could you 还是 couldn't you 还是都可以，意思不同呢？好象只能用一种吧 could I .?疑问句的否定回答是哪一个?A couldn't B mustn't C can't She couldn't speak French and she couldn't write it,either.and后面的【she couldn't】可以省略不?额就是书上说①neither could she speak French nor could she write it = ②She couldn't speak French and she couldn't write it,either = ③s Simpson couldn’t prove that he was innocent.Simpson couldn’t prove _______ _______Simpson couldn’t prove _______ ______ Simpson couldn’t prove ________ _______ _______ _______P.S.第一第二题是填不同的词是sentence transformation