"couldn't do that"和"can't do that"有什么区别

couldn't do that和can't do that有什么区别 couldn't have done和couldn't do的区别 couldn t和 They were so handsome that I couldn't do it语法错误? the thing make you unhappiness.only can I say :i couldn't do that again! You couldn't do that to save your life,是让步状语吗?状语部分是什么? I really couldn't cope the way that we do 求翻译 英语翻译动词不定式作目的状语和条件状语如何区别与翻译?比如：she has phoned to say that she will resignyou couldn't do that to save your life. It would have saved Harriet endless grief had she now told him the truth ,but she couldn`t do that. they were so young that they couldnt do the job.(同义句) they were_ young_do the job How I wish I ( ) that to him yesterday!what shall I do?A.didn't say B.hadn't said C.wouldn't say D.couldn't say I wish that you _______ do that again.(wish引导的宾从)A.shouldn't B.won'tC.wouldn'tD.couldn't can't和couldn't区别? didn't 和couldn't的区别, i don't think he could have done better than that,()?A.do i B.don't i C.could he D.couldn't he i couldn't do nothing,but thinking of you.------what does that mean?i couldn't do nothing,but thinking of you.------what does that mean?是不是等於i couldn't do anything,but thinking of you?有没有再详细一点的？关於这些句型的？ 一个词组(wait on line)题目是这样的there were so many people in the park that i couldn't find a good place 这里是doing还是to do 呢 photos选择的是to take 和taking 用so和such填空he was_______excited that he couldn't get sleepthis teacher is_________kind that we all like himhe ran____________quickly that we all couldn't catch up with himthis is_____________interesting a book that we all ebjoy reading it they