何时用apear to do,何时用apear to have done?分别要是什么时态背景?请举例说明,一楼，我有见过She appears to have known it.

来源：学生作业帮助网编辑：作业帮时间：2024/05/07 14:00:10

何时用apear to do,何时用apear to have done?分别要是什么时态背景?请举例说明,一楼，我有见过She appears to have known it.
何时用apear to do,何时用apear to have done?分别要是什么时态背景?请举例说明,
一楼，我有见过She appears to have known it.

何时用apear to do,何时用apear to have done?分别要是什么时态背景?请举例说明,一楼，我有见过She appears to have known it.
这个不是时态的问题
这是个非谓语的题
因为appear这个词后要接不定式 ,但是不定式的动词和谓语动词appear有先后的问题：比如你说的She appears to have known it.这里面know这个动作发生在appear这个动作之前,所以要用完成式的形式来表达.
那么如果不定式的动作发生在appear这个动作之后或者无须强调先后则直接用to do的一般式表达即可.
例如She appears to be the same one.她好像就是那个人.

前者是一般现在时，而后者是过去完成时

apear to do apear to have done appear to be doing
pretend to do pretend to have done pretend to be doing
很多类似搭配，其实很简单，to do表示目前或将来，to have done表示过去货已经发生。
I think we d...

全部展开

apear to do apear to have done appear to be doing
pretend to do pretend to have done pretend to be doing
很多类似搭配，其实很简单，to do表示目前或将来，to have done表示过去货已经发生。
I think we don't have to tell her the news,for She appears to have known it.
We'd better go and help her,for She appears to be looking for something.
she appears to lose her way.Let's go and help her.

收起

何时用apear to do,何时用apear to have done?分别要是什么时态背景?请举例说明,一楼，我有见过She appears to have known it. 句首做主语何时用doing 何时用to do somebody was thought to do/ have done.句型中,何时用to do,何时have done 何时用not to do sth 何时用not do sth make sb do与make sb to do的区别何时用do 何时用to do?明白问：It is ___ sb to do sth.中的“___”何时用of,何时用for? hope to do与hope doinghope to do和hope doing 有什么区别?何时用hope to do,何时用hope doing. need何时为情态动词,何时加to do 何时用现在完成时,何时用一般过去式? weekend何时用单数何时用复数? 助动词何时用be何时用have 角动量何时用mlv何时用jw the secret to 后面动词形式是ing,何时用to do? 何时用does/do 何时用is/are放在疑问句开头那种何时用do/does/did提问何时用have/has 提问?经常混乱,很痛苦. 杯酒释兵权,何时用这个词 fruit何时用复数何时用持续性动词