should have done和could have done的区别？
should have done和could have done的区别为：
一、指代不同
1、should have done：本应该。
2、could have done：本可以做到的。
二、侧重点不同
1、should have done：表达一种责备或内疚的语气。
2、could have done：表示对过去事情的假设。
三、引证用法不同
1、should have done：在表示意向、要求、决定、建议等意义的从句里，如果主句的谓语动词是过去式，则从句中的should既可看作情态动词shall的陈述语气过去式，也可看作它的虚拟语气，但当句子的语气不够委婉时宜看作前者。
2、could have done：could用于疑问句中并不表示过去时，而是表示现在时，此时语气比较委婉，有时表示把握不大或犹豫; could用于特殊疑问句常含有惊讶、迷惑等感情色彩。
一、
“must+have+done”表示对过去事情的肯定推测，译成“一定做过某事”，该结构只用于肯定句。
1.
It
must
have
rained
last
night,
for
the
ground
is
wet.
昨晚一定下雨了，因为地面还是湿的。
2.
You
must
have
been
mad
to
speak
to
the
servant.
你和仆人说话，一定是发疯了。
二、
“can't+have+done”表示对过去事情的否定推测，译成“不可能做过某事”。
1.
Mr.
Smith
can't
have
gone
to
Beijing,
for
I
saw
him
in
the
library
just
now.
史密斯先生不可能去北京了，我刚才还在图书馆见过他。
2.
Mary
can't
have
stolen
your
money.
She
has
gone
home.
玛丽不可能偷你的钱，她回家去了。
三、
“can+have+done”表示对过去行为的怀疑，用于疑问句，译成“可能做过……吗？”。
1.
There
is
no
light
in
the
room.
Can
they
have
gone
out?
屋里没有灯，他们可能出去了吗？
2.
There
is
nowhere
to
find
them.
Where
can
they
have
gone?
到处找不到他们，他们可能到什么地方去呢？
四、
“could+have+done”是虚拟语气，表示对过去事情的假设，意思是本来能够做某事而没有做。
He
could
have
passed
the
exam,
but
he
was
too
careless.
本来他能够通过考试，但是他太粗心。
五、
“may+have+done”表示对发生过的事情的推测，意思是“可能已经”或“也许已经”，用于肯定句中。
—What
has
happened
to
George?
—I
don't
know.
He
may
have
got
lost.
—乔治发生了什么事？
——我不知道，他可能迷路了。
六、
“might+have+done”表示对过去事情的推测，might与may意思相同，但可能性更小。多用于虚拟语气结构中。
1.
He
might
have
given
you
more
help,
even
though
he
was
busy.
他或许会多给你一些帮助，即使他很忙。
2.
She
might
have
achieved
greater
progress,
if
you
had
given
her
more
chances.
如果你多给她点机会，她可能已经取得更大的成绩。
七、
“would+have+done”虚拟语气，表示对过去事情的假设，意思是“本来会做”。
1.
I
would
have
told
you
all
about
the
boy's
story,
but
you
didn't
ask
me.
我本来会告诉你这个小男孩的故事，但是你没有问我。
2.
Without
your
help,
I
wouldn't
have
achieved
so
much.
没有你的帮助，我是不会取得如此大的成绩。
八、
“should+have+done”意思是“本来应该做某事，而实际没做。”
“shouldn't+have+done”表示本来不应该做某事，而实际做了。含有指责对方或自责的含意。
1.
Tom,
you
are
too
lazy.
The
work
should
have
been
finished
yesterday.
汤姆，你太懒惰了，这项工作本来应该昨天就做完的。
2.
Look,
Tom
is
crying.
I
shouldn't
have
been
so
harsh
on
him.
看，汤姆哭了，我本来不应该对他如此严厉。
十、
“need+have+done”表示本来需要做某事而没有做。“needn't+have+done”则表示“本来不需要做某事而做了”。
I
needn't
have
bought
so
much
wine—only
five
people
came.
我本来没有必要买这么多酒，只来了五个人。
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
三者有交集的地方
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...
could have done 本可以做而没有做， 能做而没有做
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.
should have done: 应该做到(而没有做)
could have done: 可以做到(而没有做)
