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can't have done
could
have
done
的用法是什么?
答:
注意:其否定形式 couldn't
have
done
没有虚拟语气的用法,couldn't have done 只能表推测,相当于
can't
have done,意为:“过去不可能做了某事。”I think that he couldn't have gone abroad. I saw him just now.我认为他不可能出国了。我刚才还看见他了。might have done might (不能...
could
have
done
的意思是什么?
答:
注意:其否定形式 couldn't
have
done
没有虚拟语气的用法,couldn't have done 只能表推测,相当于
can't
have done,意为:“过去不可能做了某事。”I think that he couldn't have gone abroad. I saw him just now.我认为他不可能出国了。我刚才还看见他了。might have done might (不能...
can
have
done
什么意思
答:
意思是 本来能做到的(但事实却没做到)例句: i'am sorry that you didn
't
pass the exam.You
can
have
passed it.(我很遗憾你没能通过这次考试,你本来是能过关的!)
can
可以用现在完成任时吗
答:
This glass is cracked. Someone could
have
dropped it.这个玻璃杯破了。可能是谁把它掉在地上了。(表推测过去)Could he have left the work unfinished?他会丢下工作不干了?(表怀疑)He couldn't have checked out so early.他不可能这么早就离开了。(表不可能)注意:
can't
have
done
...
情态动词加
Have
done
用法
答:
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 theyhave gone ...
求教几组词用法区别SHOULD
HAVE
DONE
COULD HAVE DONEWOULD HAVE DON...
答:
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 ...
情态动词+
have
done
的用法?
答:
4. could (不能用 can)
have
done
表示“过去本能够做某事却未做。”注意:其否定形式 couldn't have done 没有虚拟语气的用法,couldn't have done 只能表推测,相当于
can't
have done,意为:“过去不可能做了某事。”5. might (不能用 may) have done 表示“过去本可以做某事却未做。
情态动词+
have
done
的用法?
答:
4. could (不能用 can)
have
done
表示“过去本能够做某事却未做。”注意:其否定形式 couldn't have done 没有虚拟语气的用法,couldn't have done 只能表推测,相当于
can't
have done,意为:“过去不可能做了某事。”5. might (不能用 may) have done 表示“过去本可以做某事却未做。
would
have
done
, might have done, could have done,should have done...
答:
4. could (不能用 can)
have
done
表示“过去本能够做某事却未做。”注意:其否定形式 couldn't have done 没有虚拟语气的用法,couldn't have done 只能表推测,相当于
can't
have done,意为:“过去不可能做了某事。”5. might (不能用 may) have done 表示“过去本可以做某事却未做。
情态动词加
have
+
done
的用法
答:
2. 肯定、否定、疑问句中表推测(可能性):Don't worry. They could
have
arrived home. / The guests would have arrived by that time.(对过去的推测,*would一般用于肯定句)can have
done
否定、疑问中表推测:He
can't
have slept with the noise. (把握性极大的推测)Can he have ...
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