实用语法--定语从句

　　1. 定语从句的定义：

　　2. 定语从句的关系词：

　　3. 由“介词+关系代词”作介词宾语引导的定语从句：

　　注意点：

　　1)介词后面的关系词不能省略。

　　2)that前不能有介词。

　　3)某些在从句中充当时间，地点或原因状语的“介词+关系词”结构可以同关系副词when, where和why互换。

　　This is the house in which I lived two years ago.

　　4)固定搭配的词组，不能把介词提到关系代词前。

　　(正)He has a little son (whom¹/that) he has to look after.

　　(误)He has a little son after whom he has to look.

　　4. 只用关系代词that的情况：补充

　　1)当先行词是all，everything，nothing，something，anything，little，much等不定代词时

　　Is there anything (that) you don't understand?

　　2)先行词被all，every，no，some，any，little，much等修饰时。

　　You can take any seat³ that is free⁴.

　　3)当先行词前面有the only，the very，the last等修饰时。

　　He is the only person⁵ that can help you out.

　　4)当序数词或形容词最高级修饰先行词时。

　　This is the second time that you told us the story.

　　This is the best book that I have ever² read.

　　5)先行词同时含有人和物时。

　　We talked about the things and people that we were interested⁶ in.

　　6)当主句是以疑问词who或which开头的特殊疑问句时。

　　Who is the boy that is playing football?

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