一.用that不用which

1）先行词是最高级或他前面有形容词最高级时

This is the best --that-- has been used against air pollution in cities.

English is the most difficult subject --that-- you will learn during these days.

2)先行词是序数词或它前面有一个序数词时

He is the last person --that-- i want to see.

3)主句中有疑问句

Which is the pen --that-- you lost?

4)先行词既有人又有物时

The bike and its rider --that-- had run over an old man were taken to the police station.

5)先行词是 all, much, little ,something,everything,anything,nothing,the one时

6）先行词前有 only,any,few,little,no ,all,one of,the same, the very等词装饰时

7）有2个定语从句，其中一个关系代词已用which，另一个应用that。

Tom built up a factory which produced things that had never been seen before.

二.用which不用that：关系代词前有介词

This is the school in --which-- you will study.

.原句本来就有that

Let me show you the book --that-- i borrowed from the library --which-- was newly open.

哎,没分的,打那么辛苦白干了...T-T

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