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must been done
过去完成时被动语态反意疑问句怎么改
答:
must
have
done
的反意疑问句 对已发生的过去情况的推测,若陈述句谓语部分有“must have done”,而且有表示过去的时间状语,问句部分用didn't;若没有表示过去的时间状语,问句部分用haven't或hasn't。如:1)They must have gone there last night,didn't they?2)They must have arrived by ...
情态动词+have
done
的用法
答:
You
must
have
been
mad to speak to the servant.你和仆人说话,一定是发疯了。2、“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”。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。3、“can+have+done”表示对过去行为的怀疑...
must
have
been
后面加动词,是不是一定要用doing?可以用
do
吗?如果可...
答:
不可以用
do
,因为其后面是接ing形式的,表示现在完成进行时,如果跟do时,只能同
must
连用。如:They must have
been
washing the clothes now.
Must
he finish his homework?
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. ...
could have/might have /
must
have/should have都有什么区别
答:
He didn't hear the phone. He
must
have
been
asleep.2. can(could)have
done
表示对过去的时间内可能发生的事情的猜测,can have done 一般只用于否定句和疑问句。could have done 还...
should have
done
.would have done.
must
have done三者之间的意思和用...
答:
He knew he arrived she would have gone home. 他知道他到时她会已经回家了 3.
must
have
done
的含义。“must have+过去分词”表示对过去的推测,意思是“一定已经,想必已经,准是已经….”,只用于肯定句中。例如:He must have
been
drinking beer. 他肯定一直喝啤酒来着。若要表示否定,要用...
must
have
been
的用法和意思
答:
Must
have
been
当时一定是,表示对过去某一时刻内动作的猜测,否定can't have been当时不可能是
情态动词的被动语态
答:
情态动词中,主语和谓语动词之间有关系:主动关系或被动关系。 当主语与谓语为被动 关系时,体现主语为动作的承受者时要用被动语态(the Passive Voice)。在被动结构为:主语+
be
过去分词 +by+动作执行者。常见的情态动词为:can (could), may (might),
must
, have to, shall (should), will (...
英语中存在mustn't have
done
的形式吗
答:
done
.请看常见的“情态动词 + have + 过去分词”的用法:一、“
must
+ have + 过去分词”表示对过去发生的事情或状态进行推测,语气比较坚定,通常只用于肯定句。如:it must have rained last night,for the ground is wet.you must have
been
mad to speak to the servant.二、“can / could...
语法非谓语
答:
现在分词 doing : 有being
done
(被动式) ; having done (完成式); having
been
done
(完成被动式) 不定式 to do : 有to be done (被动式); to have done (完成式); to be doing(进行式) 动名词 doing : 有having done(完成式); being done(被动式) ; 非谓语动词的特点:三种非谓语动词都具有动...
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