什么时候可以用whom不能用who 定语从句who whom区别?

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定语从句who

定语从句who whom区别?

whom区别?

定语从句分为限制性定语从句和非限制性定语从句。关系代词who 和whom用在先行词是表示人的词后,当该先行词在定语从句中用作主语,关系代词用who,在从句中做宾语,关系代词用whom.如果是在限制性定语从句中,做宾语也可以用who替代。但是,在非限制性定语从句中,who和whom不可替代。比如1)He is the man whom(可用who替代)I am waiting for. 2)He is the man,whom(不可以用who替代) I am waiting for.

who在介词后面用whom对吧?who在介?

who是主格,whom是宾格,除引导定语从句用介词 whom不用who,大多数情况下who包含whom,主格只用who,宾格who,whom都可用.

什么时候不能用whom定语从句?

当先行词在定语从句中不作宾语的时候,不能用whom,也就是说,whom在定语从句中只能作宾语,而且先行词必须是指人的时候,才能用whom, 其它情况一律不能用whom,例如:
The boy who is standing there is my classmate.站在那边的男孩是我同学。(本句中,先行词在从句中作is standing there的主语,所以关系代词用who, 不能用whom)

为什么who提问的是宾格,为什么还要用who不用whom呢?

who在英语口语中,不仅对代词宾格进行提问,也可以对主格提问。who在口语中可以代替whom。当前面有介词时只能用whom。
例如1)He finished his homework on time.可转化为Who finished his homework on time(who对句中主语进行提问,不能用whom代替)
2)Tom is waiting for his girlfriend.可转化为Whom(Who) is Tom waiting for(口语中通常用who代替whom)
3)He is working in the same school with his mother.可以转化为With whom is he working in the same school(这儿的whom不能用who代替。)