定语从句中修饰人时

who，that在很多情况下可以通用，但是有些情况只能用who:

1. 先行词是one, ones, anyone的时候宜用who.

One who has nothing to fear for oneself dares to tell the truth.

The ones who flatter me don’t please me.

Don’t tell anyone about the news who oughtn’t to know it.

Anyone who fails to finish the task given should be criticized.

2. 先行词为those的时候，宜用who为关系代词

Those who were not fit for their work could not see the beautiful clothes

made of the magic cloth.

Those who want to go to the Great Wall sign up here.

3. 当先行词有比较长的后置定语的时候

I met a foreigner in the street yesterday who could asked me questions in

Chinese.

4. 一个句子中带有两个定语从句，其中一个定语从句的关系代词为that,另一个则用

who.

The boy that you met last night is the group leader who studies very hard.

5. 在there be 开头的句子中

There is an old man who wants to see you.

There are many young men who are against him.

一般没有只能用that不能用who的情况，能用that的句子，也能用who