1.先行词是不定代词或被不定代词修饰
2.先行词被最高级、序数词、the only 或 the very 修饰
3.先行词既有人又有物
4.前面已经有which或who
1.先行词是不定代词或被不定代词修饰
all , anything, everything, something, nothing ,any
所有做宾语的都可以省略；
all （that）（不定代词）= what(名词性从句)
:::info
All __she likes to do is driving her car on the highway.
A. this
B. that
C. what
D. which
分析 因为先行词为All 所有只能用that，that在从句里面做宾语，that也可以省略
:::
2.先行词被最高级、序数词、the only 或 the very 修饰
典型例题：
:::info
This is the best novel __I have ever read.
A. which
B. where
C. that
D. what
分析先行词为novel小说，先行词被the best 最高级修饰，后因为that在后做宾语，that可以省略 :::
3.先行词既有人又有物
人或物_and 物或人_that
常出现的即有人又有物：
the people and the things. 人和事
the books and the wonter.书和作家
the violin and the violinist. 小提琴和小提琴家**
典型例题 :::info We are talking about the piano and the pianist __were in the concert we attented last night.
A. which
B. whom
C. who
D. that
分析 and的前面的先行词 the piano 钢琴（物） 和 后面的先行词 the pianist 钢琴家（人，ist结尾的表示 …..家），先行词即有人又有物，用that :::
4.前面已经有which或who
前面已经出现which或who 为了避免重复用that
典型例题 :::info Which is the book__you bought yesterday?
A. which
B. that
C. what
D. the one
分析前面出现which，按照常理来说先行词为the book为物，后面从句缺少宾语 （you bought vt.及物动词 后加宾语）主谓少宾，用which，但是为了避免重复，用that :::
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