定语从句用法（下）
1. 只能使用that 的几种情况
在下面的情况下，只能使用that 引导定语从句。
1. 当先行词是不定代词或被它们修饰时。
Is there anything that I can do for you?
有什么要我做的吗？
All that can be done must be done.
凡是能做的事情都必须做。
He answered few questions that the teacher asked.
他几乎没有回答老师的那些问题。
2. 当先行词被形容词最高级或序数词修饰时。
This is one of the most interesting books that were sold in this bookstore.
这是这家书店售出的最有趣的书之一。
The first thing that should be done is to get some food.
