“介词 + which / whom”引导的定语从句 “介词+关系代词”引导的定语从句，是定语从句一种介词前置的定语从句句型，介词与关系代词之间存在一种介宾关系。当关系代词在定语从句中作介词宾语时，把介词置于关系代词前，即演变出“介词+关系代词"句型。例如： The man who/whom /that you spoke to is a teacher. =The man to whom you spoke is a teacher.一、基本构成 1.“介词+关系代词”结构引导的定语从句中,关系代词只能用 which（指物)或 whom(指人） ，即：介词+which/whom. (1）The man to whom you spoke is a teacher.（2）The city in which she lives is far away.（3）The little girl is reading a book，in which there are many cartoons。注意：当介词放在关系代词的前面时，用在介词后的关系代词不能省略. 2.在限制性定语从句中，当介词置于定语从句的谓语动词之后时，可用 that/which(指物);that/who/whom(指人)作介词的宾语。且此处关系代词可以省略，特别是在口语中.如： （1) The man (who/whom /that )you spoke to is a teacher。（2)The city（which/that)she lives in is far away。注：通常介词放在定语从句中动词后，也可以放在关系代词前面，但有些特别动词短语搭配不能拆分,介词只能放在动词后，如： look for， look after, pay attention to ,take care of , look forward to， listen to 等。This is the pen that / which you are looking for.The patient whom she is looking after is her father。 The words that /which we should pay attention to are written on the blackboard.There are fifty patients who/whom/that we must take good care of.练习：Are these sentences right？ （1） The man with whom you talked is my friend. （2) The man(who/that） you talked with is my friend。 （3) The man with who/that you talked is my friend。 (4） The plane in which we flew to Canada is very comfortable。 （5) The plane in that we flew to Canada is very comfortable。 二、关系副词 when，where,why 可用“介词＋which"来代替。关系副词实际上是介词＋先行词。其中when=表...
