1 、在复合句 ( 包括主句和从句中 ) ，修饰主句中某一名词或代词的从句，叫做定语从句。它所修饰的词叫先行词。定语从句跟在先行词的后面。定语从句定语从句的基本结构•先行词 + 关系词+ 从句The baby is smokingThe baby is cute.The baby is smoking .The baby who is smoking is cute. 关系代词先行词定语从句先行词是人，在从句中做主语时可用 that 或 who, 不可省略。 不可用 whom 和 which• The building that/which is being built will be used as a library.• 先行词是物，在从句中做主语时，可用 that 或 which ，不可省略 The baby is dancing.The babies are lovely.The babies are dancing.关系代词关系代词在意义上与所修饰的先行词一致。The babies who are dancing are lovely. 做主语 The boy was John’s brother. 关系代词做宾语 The boy (who/whom/that) we saw yesterday was John’s brother.We saw the boy yesterday.可以省略！先行词是人，在从句中做宾语时，可先行词是人，在从句中做宾语时，可用用 whowho 、、 whomwhom 、、 thatthat 或省略。或省略。 The boy was John’s brother. 关系代词做宾语 The boy (who/whom/that) we saw yesterday was John’s brother.We saw the boy yesterday.可以省略！关系代词的关系代词的主宾格形式主宾格形式由它在由它在从从句中所充当的句中所充当的成分成分决定。决定。 •The farm that/which we visited last week is very beautiful.先行词是物，在从句中做宾语时，可用 that 或 which ，可省略 对比一下• I’ll never forget the days ______we spent together.that I’ll never forget the days ___ we worked together.whenDo you know “whose”?The woman is our English teacher.Her hair is very short.The woman whose hair is short is our English teacher. 主格 宾格 所有格代人who(who/whom) whose代物( 包括动物）that(that)which(which)whosethat(that)注意： what 不能引导定从1.The one million people of the city, ______ thought little of these events, went to bed as usual that night.2.It was heard in Beijing ， is one hundre...
