The relative pronouns are:
關(guān)系代詞有：

We use who and whom for people, and which for things.
我們用who和whom指代人，用which指代物品。

Or we can use that for people or things.
或者可以用that指人或物。

We use relative pronouns:
下列情況中我們使用關(guān)系代詞:

? after a noun, to make it clear which person or thing we are talking about:
在名詞后加關(guān)系代詞，用于指明我們所談?wù)摰娜嘶蛭铮?/div>

the house that Jack built

the woman who discovered radium

an eight-year-old boy who attempted to rob a sweet shop

? in relative clauses to tell us more about a person or thing:
在關(guān)系從句中提供關(guān)于某人或某物更多的信息：

My mother, who was born overseas, has always been a great traveller.

Lord Thompson, who is 76, has just retired.

We had fish and chips, which is my favourite meal.

But we do not use that as a subject in relative clauses.

We use whose as the possessive form of who:
我們用whose表明所有權(quán)：

This is George, whose brother went to school with me.

We sometimes use whom as the object of a verb or preposition:
有時(shí)用whom作為一個(gè)動(dòng)詞或介詞的賓語：

This is George, whom you met at our house last year.

This is George’s brother, with whom I went to school.

But nowadays we normally use who:
但今天我們通常用who：

This is George, who you met at our house last year.

This is George’s brother, who I went to school with.

When whom or which have a preposition the preposition can come at the beginning of the clause...
當(dāng)用whom和which有介詞時(shí)，介詞可以前置：

I had an uncle in Germany, from who[m] I inherited a bit of money.

We bought a chainsaw, with which we cut up all the wood.

… or at the end of the clause:
或者是放在句子最后：

I had an uncle in Germany who[m] I inherited a bit of money from.

We bought a chainsaw, which we cut all the wood up with.

We can use that at the beginning of the clause:
也可以將that放在句子開頭：

I had an uncle in Germany, that I inherited a bit of money from.

We bought a chainsaw, that we cut all the wood up with.