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can't have done
can't
have
done
是什么意思?
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/cou...
mustn't
have
done
和
can't
have done的区别最好有例子
答:
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,所以只能用情态动词can或could,第二句的答语表示对过去的推测,所以用can't have
done
.请看常见的“情态动词 + have + 过去分词”的用法:一、“mus...
mustn't
have
done
和
can't
have done的区别最好有例子
答:
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,因为他不是那种人。
can
have
done
和could have done的区别?
答:
can
have
done
是表示应该做某事而没有做,所以既然知道没有做,那肯定是已经发生了。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m...
can
have
done
的用法
答:
1.
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?“2.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。3.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。4...
can't
have
done
的用法
答:
He
can't
have
taken it home.他不可能把它带回家了。(表不可能)could have
done
could have done 可用于肯定句、疑问句和否定句。用于肯定句既可以表示过去能够做而实际未做,有惋惜、遗憾或委婉批评之意,也可以表示对过去动作的推测;用于否定句和疑问句的情况与can have done相同。例如:You ...
couldn't
have
done
和
can't
have done 怎么区分?分别用在什么情况下...
答:
can
't
have
done
(过去一定没做...),是对过去推测的否定形式。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&...
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...
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...
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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