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can have done
mustn't
have
done
和
can
't have done的区别最好有例子
答:
can
't
have
done
表示以前不可能做某事.例句 ---Where___Margaret have put the empty bottles?---She___them away.They must be somewhere.A.can;can't have thrown B.must;must have thrown.C.must;needn't D.can;must throw 答案为A.第一个句子是一个疑问句而且表示可能性的推测,所以...
could
have
done
和 might have done 的区别
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...
mustn't
have
done
和
can
't have done的区别最好有例子
答:
他一定已经完成这项工程
can
't
have
done
:(1) 其实,是must have done 的否定形式!也就是说,通常不说 mustn't ...(2) 表示推测,比较肯定,是说话人根据对某人某事平常的了解,不可能发生。He can't have done that for he is not that kind of man. 跟读 他不可能这么做的,因为他不...
May not
have
done
是表示可能不还是不可能 那Could not have done呢...
答:
情态动词+
have
done
must have done(仅肯定) 过去一定做过 might have done 可能做过 may have done (仅肯、否) 过去也许做过 may not have done 过去可能没有做过
can
have done(肯、否、疑) 过去可能做过 can not have done 过去不可能做过 could have done 过去本...
mustn't
have
done
和
can
't have done的区别最好有例子
答:
1.Mr.Smith
can
't
have
gone to Beijing,for I saw him in the library justnow.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。“mustn't have
done
”没有这种搭配,这是一定要记住的!只有...
can
't
have
done
和 couldn't have done 有什么区别?能举例说明一下吗...
答:
她们两个表示不可能的时候,是同样的意思,只是
can
't
have
done
表示的事情更接近于说话时而已,比如 can u look at my article, i'm quite sure i can't have found any bugs.can't have done 还有另外一个意思就是表示 允许,责任之类的否定意思,couldn't have done 没有这个意思。相当...
couldn't
have
done
和
can
't have done 怎么区分?分别用在什么情况下...
答:
例如: I saw her just now,she
can
't
have
gone to Beijing. 我刚才看见她的,她不可能去了北京。couldn't have
done
是虚拟语气,表达与过去的事实相反。例如: If I hadn't been told,I couldn't have known this. 假如别人不告诉我,我就不会知道这件事。
has
/
have
+
done
与
had
+done的用法和区别
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
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...
关于这个句子的时态
答:
例如:You could
have
passed the exam, but you were too careless. 本来你能够通过考试,但是你太粗心。在告诉楼主其他类似的用法吧 1.“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。2.“
can
't+have+done”表示对过去事情的否定推测,译成“不可能做...
can
't
have
done
和couldn‘t have done 的区别
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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