先行词如为表示物的名词或代词，在从句中又作介词的宾语时，只能用which。如：?

This is the pan in which I boiled the milk. 这就是我煮牛奶的锅。?

前面有as时,引导定语从句的关系代词用as，不用which。如：?

There are as many dictionaries as are needed.所需要的字典都有了。?

前面有such时，引导定语从句的关系代词用as,不用which。如：?

Such women as know Tom thought he was charming.?

认识汤姆的女人都认为他很?迷人。??

I have never heard such stories as he tells.他讲的那些故事我从没听过。?

He is not such a man as I expected.他不是我期望的那种人。?

前面有the same时，引导定语从句的关系代词用as而不用which。如：?

We are facing the same problems as we did years ago.?

我们正面临着和多年以前同样的困难。?

This is the same wallet as I lost.这只钱包与我丢失的那只相同。?

I have the same trouble as you have.我和你有着同样的困难。?

总之，which与as引导定语从句的区别要在实践中多体会，体会多了，才能正确运用。??五、定语从句中的谓语动词与先行词保持一致的问题

1.one of+复数名词+关系代词+复数形动词。如：?

Titanic is one of the most wonderful movies that have been produced in Hollywood.《泰坦尼克号》是在好莱坞拍的最好的电影之一。?

2.the (only)one of+复数名词+关系代词+单数形动词。如：?

The Great Wall is the (only)one of the buildings on the earth that is seen from the moon.?

长城是地球上惟一一个从月球上能够看到的建筑。?

3.当关系代词as或which引导非限制性定语从句，修饰主句内容时，若as或which作主语，则从句的谓语动词用单数形式。如：?

Great changes have taken place in China，as is known to all.?

中国发生了巨大的变化，众所周知。?

4.其他情况?

I，who am your teacher，will try my best to help you.我，你的老师，要尽全力帮助你。?

To own a colour TV set in each family，which we thought was impossible twenty years ago，now becomes true.?

每家拥有一台彩电，这在20年前我们认为不可能的事情，现在变成了现实。?

Have you heard of the persons and things that are being talked about??

你听说了他们谈论的人和事了吗???

【考点诠释】