the same....as　 such ...as　 as ... as， so…as

1.　　　 Take as many books as you want.

This was the American Civil War, which lasted 4 years before the North won in the end.

He was taken to another room, where he found a wounded boy, who was dying.

1). The box is full of bottles.　 He is standing on the box.

　----> The box on which he is standing is full of bottles.

　　　 The box where he is standing is full of bottles.

2). This is the train.　 We work on the train.

---->This is the train on which we work.

　　　 This is the train where we work.

3). I know the reason. She did it for the reason.

---->I know the reason for which she did it.

　　　 I know the reason why she did it.

4). The man is our school master. You shook hands with the man just

now.

　----> The man with whom you shook hands is our schoolmaster.

5). The pen is made in Shanghai.　　 She is writing with the pen.

　----> The pen with which she is writing is made in Shanghai.

　不能拆开的词组： look for / look after / catch hold of /take care of / put on / take off…….

7.先行词被all, every, no, some, any, little, much修饰时

All that glitters is not gold.

I’ve read all the books that you gave me.

6.先行词是everything, nothing, something, all, little, much,

everybody等不定代词

　　 Tell us everything that you know, please.

　　 Is there anything that you don’t understand?

5.先行词为the only, the very, the last, the same所修饰的定语从句

　　 He is the very person that the police are looking for.

　　 This is the only thing that I can remember.

4.主句是who或which开头的特殊疑问句中的定语从句

　　 Who is the man that came this morning?

　　 Which is the bag that you lost?

3.先行词既包括人又包括物

They talked of things and persons that happened in the school.

He talked about the teachers and schools that he had visited.

2.先行词为序数词所修饰

I happened to be the thousandth guest that visited the great hotel.

This is the first composition that he has ever written in English.

1.先行词为形容词最高级所修饰

　　 This is the longest bridge that I have ever seen.