should have done和could have done的区别？
二者都是虚拟语气，区别在于含义的不同。
1、should have done意为“过去本应该做某事却未做。”，表达一种责备或内疚的语气。
2、could have done意为“过去本能够做某事却未做。”，表示对过去事情的假设。
3、could have done还可以表推测一般用在否定句和疑问句中，表示不相信或怀疑的态度。
4、表示推测过去某动作发生的可能性时，就表示的可能性程度而言，should 比 could可能性要大。
例句：
①He could have looked over the papers in less than ten minutes.
他本可在10分钟内把文件翻看一遍的。
②If I'd waited in for you I could have waited all day.
要是我真留在家等你，那早都等上一整天了。
③He should have stuck to his guns and refused to meet her.
他本应坚持己见，拒绝与她会面。
④The night shift should have been safely down the mine long ago.
上夜班的矿工应该早就安全地到达井下了。
⑤I don't think we should have been there in the first place.
我认为我们从一开始就不该在那儿。
扩展资料
相关句子：
①I don't think we should have been there in the first place.
我认为我们从一开始就不该在那儿。
②The competition should have been rescheduled for a later date.
比赛本应另择日期。
should have done和could have done的区别：
1、could have done 本可以做而没有做， 能做而没有做 。
2、shuld have done 本应该做而没有做，猜测。
拓展资料
should have done的用法
1、You should have done that yesterday you idiot!
你本该昨天把它做完的，你这个白痴！
2、I just did what I should have done.
我只是做了份内该做的事。
3、I should have done that to you years ago.
很多年前我就应该这样了。
4、That is what I should have done after all that controversy concerning Rooney and me.
在我和鲁尼的事情上引起争议后，这是我最该做的事情。
5、I never did actually, so I think I should have done more.
事实上我还没有，所以我想我应该做得更多。
could have done
1、Whoever could have done such a dreadful thing?
究竟是谁能干出这种可怕的事呢？
2、Yes, perhaps I could have done better, but that's not what I want in life.
是的或许我可以做得更好，但这是不是我要的生活。
3、Had I been informed earlier. I could have done something.
我要是早得到通知，我就能干事了。
4、You could have done better in my place.
你要是处在我和位置可能比我干得好。
5、With better equipment, we could have done better.
要是有更好的设备，我们会做的好的了
should have done 是说 一件事情本来是有益/有帮助的/想做好的事情 你并没有做到 因而给你之前的动作提出另外一种建议的含义。
could have done是说一件本来有可能完成的事情你没有做到 重在说可能性，
would have done 是说一件一定可以完成的事情 你没有做到 这是对假象的结果（唯一）的猜测
比如说你考试没过你老师和你说 u should have passed the exam.你应该要过的（过了肯定对你有好处，）对你提出建议，如果是couldhave就是你本来可以过的（你有可能性/机会过的，这种可能性/机会包括个人能力或者是外部条件都行，但是你没过），wouldhave就是说你本来一定可以过的（你来了肯定过，但是可能是发生意外了，你没去考试）
此外，should have done 还可以表示后悔和自责的情绪 或者是给当下提建议 还有表示客气 或者是表示一件事情按计划/常识来看应该已经发生了。看语境需要 当你说 u should have done sth 不一定是指责他 ，比如有人做什么事情没做成，而你知道怎么做，你可以说 u should have told me. 你应该告诉我的，言下之意是你以后要做可以找我帮你。
表客气是比较固定别人送你礼物的时候你可以说 u should not have.
表示按计划/常识应该已经发生了 比如 按他的预期他现在已经完成了 可以说 if everything goes as expected, he should have finished work by now.
couldhavedone也可以单纯的表示对过去的猜想等于itwaspossiblethat..比如一个人迟到了，你可以说hecouldveoverslept.
could not have 就是 it was impossible that...
shuld have done 1。本应该做而没有做；2。猜测
1. You could have won the first prize if you have spent more time on it.
2. The ground is wet. It should have rained last night.
3. It's 8 o'clcok. I am very hungry. You should have cooked the dinner.
could have done: 可以做到(而没有做)
