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can have done
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。
could
have
done
的用法是什么?
答:
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。”I think that he couldn't have gone abroad. I saw him just now.我...
could/may/might
have
done
sth
答:
是的 must
have
done
表示对过去某事的肯定猜测,译为:过去肯定做了某事。不存在 mustn't have done 的形式。其否定或疑问形式须用
can
(could) 来表示. 例如: Since the road is wet, it must have rained last night. 既然路是湿的,那昨天晚上肯定下雨了。He can't have missed the way. ...
情态动词加
have
done
答:
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 out?屋里没有灯,他们可能出去了吗?2. There is nowhere to find them. Where canthey have gone?到处找不到他们,他们可能到什么地方去呢?四、...
have
done
的否定是什么?
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。
can
't
have
done
...的否定形式是什么?
答:
can
't
have
done
(不可能做过)是must have done(一定做过)的否定形式。couldn't have done(可能没做过)是may have done(有可能做过)的否定形式。一般认为can't have done有80%以上的把握.而couldn't have done则委婉的多,只有50%左右的把握.must do /can't do一定,肯定80%把握。may/...
could
have
done
的意思是什么?
答:
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。”I think that he couldn't have gone abroad. I saw him just now.我...
情态动词加
Have
done
用法
答:
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 out?屋里没有灯,他们可能出去了吗?2. There is nowhere to find them. Where canthey have gone?到处找不到他们,他们可能到什么地方去呢?四、...
情态动词加
have
done
是什么结构?
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。
couldn't
have
done
的用法是什么
答:
couldn't
have
done
和
can
't have done都表示不可能,是对过去情况的推测。例句:He can't / couldn't have worked out the problem.他不可能解决了这个难题。can't 也可以用于对现在情况推测,couldn't have done可以用 和过去事实相反的虚拟语气。例如:If you hadn't gone to the party,you ...
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