that用作先行词时后接定语从句的用法(that which型)

that用作先行词时后接定语从句的用法(that which型)

当代词 that 用作先行词后接定语从句时，定语从句通常用关系代词which来引导。如：

We have that which we need. 我们需要的东西都有了。

That which I say and do is my own affair. 我说什么做什么是我自己的事。

The true cost often differs from that which had first been projected.  实际成本经常与最初计划的有所不同。

What is that which you have just stuffed into the plastic cup? 你刚才塞在塑料杯里的是什么东西?

They say the only real knowledge is that which can be measured. 据说唯一真实的知识是可以检验的知识。

但 that which 这一说法相当正式，在现代英语中通常改用 what。如：

That which (=What) many people say is not always true. 很多人说的话并不表示一定是真的。

顺便说一句，that 后可接定语从句，但 this 后习惯上不接定语从句。