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may not have done
can
have
done
和could have done有无区别?can't have done和couldn't...
答:
could
have
done
表示本能做而实际未做,是虚拟语气.2、can't have done和couldn't have done的区别 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。
can
have
gone和
may
have gone的区别
答:
我会用could,表推测的。can 应该也可以,但我不会用may may /
might
have
done
表示“过去可能做了某事”。
may
比 might 表示的可能性在说话人看来稍大些。may/might
not
have done表示“过去可能没有做某事。”例如:I can't find my keys. I may / might have left them at the school ...
can
have
done
和could have done区别
答:
could
have
done
表示本能做而实际未做,是虚拟语气.2、can't have done和couldn't have done的区别 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。
can't
have
done
和couldn‘t have done 的区别
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 do/...
can
not
have
down与could not have down有什么区别
答:
5.
might
(不能用
may
)
have
done
表示“过去本可以做某事却未做。” 注意:其否定形式 might
not
have done 没有虚拟语气的用法,might not have done 只能表推测,相当于 may not have done,意为:“过去可能没有做某事。”二、表推测的用法 1. must have done 表示对过去某事的肯定猜测,...
mustn't
have
done
和can't have done的区别最好有例子
答:
They
may
not
have
known it beforehand.You
might
have read about it in the papers.四、“need + have + 过去分词”表示过去做了不必做或不需要做的事情,或过去做某事纯属多余.如:Need they have
done
it last week?I needn't have bought so much wine—only five people came.五、“...
情态动词加
have
+
done
的用法
答:
注:否行形式为:can't / couldn't
have
done
may
have done 也许 / 或许,一般用于肯定、否定句,不用于疑问句:It's too late. He may have gone to bed. (把握性不大的推测)He may
not
have finished his work. (把握性不大的推测)
might
have done 同上,比may语气更弱 should /...
must
have
done
什么意思
答:
must
have
done
是对过去发生的动作最有把握的猜测,意思是“一定”。例如:走到门外看到地上湿的,便猜“刚才一定下过雨了”,英语就是 It must have rained. 把握差一点的用should;例如地上不是太湿,你猜“刚才应该下过雨吧。” It should have rained. 把握再差一点的用
may
: It may ...
求高手解英语题目
答:
1.d 2.b 3.a 4.a 5.d 6.c 7.d 8.a
shall should
may
might
can could must虚拟语气的用法与区别比较_百 ...
答:
should
have
done
/ ought to have done:表示过去本应该做某事而实际上没有做。 should
not
have done / ought not to have done:表示过去本不应该做某事但事实上却做了。 need have done:表示过去本来有必要去做某事,但事实上没有做。 need not have done:表示过去本来没有必要做某事,但事实上却做了。
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