在定语从句中 that与who witch的用法区别

都可以
This is the kite ___which__ Billy gave to Tom

who代人，which代物，that两者都可，定语从句: 在复合句中修饰名词或代词的句子在复合句中充当定语，所以叫作定语从句。

先行词： 定语从句所修饰的名词或代词。

关系词： 引导定语从句的词，分为关系代词（who,whom,that,which,whose）和关系副词(where,when,why,)。

复合句 ： The man who (that) came is Mike.

先行词 关系代词

Li Ming is the one that got full marks in our class.

先行词 关系代词

上句的黑体字为复合句中的主句，蓝体字为定语从句.

一 定语从句的关系代词 Which的用法: 若先行词指物则代替先行词在定语从句中充当主语或宾语.

This is the pen which was given by my friend.

先行词 指物代替先行词在定语从句中充当主语

This is the pen which my friend gave to me.

先行词 指物代替先行词在定语从句中充当宾语

二 定语从句的关系代词 Who的用法: 若先行词指人则代替先行词在定语从句中充当主语或宾语(如果前面带介词则必须用whom)

The man who is wearing a white suit is my brother.

先行词 指人代替先行词在定语从句中充当主语

The man who\whom he wanted to see last week is in Shanghai.

先行词 指人代替先行词在定语从句中充当宾语

She is the girl wit