can't与couldn't区别,做题初三总是好两个一起来,怎么区分,特别用could I提问时分不清,

couldn't与can't的区别! can't与couldn't的区别 can't和couldn't区别? As she was very weak,she couldn't move这里的couldn't与can‘t区别,couldn't表示过去时? can’t have been与couldn’t have been的区别? can’t / couldn’t have may not/can't/couldn't/needn't/mustn't举例区别意思和用法 can't too与couldn't too的区别Paul is kind,hardworking and intelligent,in a word,I can't think too highly of him.(怎么夸都不为过).能否用couldn't? 请问英语中couldn't wouldn't needn't mustn't的区别与用法? didn't 和couldn't的区别, I can`t stand this class any more.与I couldn`t agree more!这两个 句型的区别,难道只有语义的区别吗? couldn't have done和couldn't do的区别 couldn't have finished和 can't have finished 的区别 couldn't do that和can't do that有什么区别 can't与couldn't区别,做题初三总是好两个一起来,怎么区分,特别用could I提问时分不清, couldn't don't have to needn't的区别 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 have hoped for a better outcome什么意思,另外can't have done和couldn't have done什么区别