定语从句： 人 物
1. 主语 who/that which/that
2. 宾语 who/whom/that/省略 which/that/省略
3. 定语 whose the n.of which/whose
4. 表语 that that
5. 状语
不能用which只能用that：
1.先行词本身是不定代词all/everything/anything/nothing/much/few/little/none/the one
2.先行词被一些词修饰（序数词，最高级）only/few/any/little/no/all/every/very
3.先行词中既有物又有人
4.who/which/that开头
只能用which不能用that
1. 在非限定从句，先行词是物
2. 先行词本身是that
3. 当关系词前面有介词
只能用who不能用that
1. 先行词是one/ones/anyone/those/I/you/he/they
2. 先行词是人，后面有较长的修饰词
3. there be开头
4. 在非限定从句，先行词是人
5. 在介词前置时只能用whom
one of n.（复数）+定语从句 定语从句中谓语用复数
the only one of n.（复数）+定语从句 定语从句中谓语用第三人称单数
区分定语从句和强调句：把it is…that去掉，若句子完整是强调句
eg：it is the Suez Canal that separates Asia from Africa.
It is/was +被强调部分+that+句子剩余部分
若先行词是situation之类的抽象名词，用in which/where
先行词是the way 做方式状语，用 in which/that/省略
the same …as 表示同一类事物
the same …that 表示同一件物品
eg：this is the same bike as I lost.
This is the same bike that I lost，so I take it home.
He has four daughters，none of whom is a pianist as he is.
He has four daughters. None of them is a pianist as he is.
He has four daughters，and none of them is a pianist as he is.
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