定从介词后面宾语指人 1.由“介词+关系代词”引导的定语从句主要用于正式文体，在非正式文体中通常将介词放至句末。如：This is the man to whom I referred.我指的就是这个人。This is the man（whom）I referred to.我指的就是这个人。 2.直接用于介词后作宾语的关系代词which不能换成that，直接用于介词后作宾语的关系代词whom不能换成who。但若介词用于句末，则用作宾语的which，whom也可换成that，who，或者省略不同。如：这是一个我们讨论了许多的问题。This is a subject about which we have talked a lot.（whichT能换成that，也不能省略）This is a subject which we have talked about a lot.这是一个我们讨论了许多的问题。（which可以换成that，也可以省略）。 3.关系副词when，where，why根据情况有时可换成“介词+关系代词which"。如：That is the day when[=on which]he was born.那就是他出生的日子。That is the house where[=in which]he lived.那就是他住过的房子。That is the reason why[=for which]he must apologize.那就是他必须道歉的原因。 4.在很正式的文体中，“介词+关系代词”引导的定语从句可紧缩成“介词+关系代词+不定式”结构。如：在那儿孩子们有个玩要的花园。正：There the children had a garden in which to play.（E）E：There the children had a garden in which they could play.（E式）E：There the children had a garden to play in.（较口语化）注：这类“介词+关系代词++不定式”结构中的介词不能没有，也不能放在句末。如不能说There the children had a garden which to play in. 本文来源：https://www.wddqw.com/doc/e67bbf0b13661ed9ad51f01dc281e53a580251c2.html