一 快捷识记
限制性定语从句和主句之间不用逗号分开，修饰主句中的某一个名词或名词词组或代词；非限制性定语从句常用逗号和主句隔开，可以修饰主句中的某一个词，也可修饰整个句子。非限制性定语从句不能用that引导，引导非限制性定语从句的关系词不能省略。
非限制性定语从句例：Li Pings father, who works in a factory, is an engineer./He tore up my photo, which made me very angry.(which指代主句内容，因前后两句是因果关系，此时which不可换为as。)
He is good at physics, as is known to us all.＝As is known to us all, he is good at physics.(as指代主句内容，在as is known/believed, as we all know/believe这类结构中as不可换为which)
二．随堂测试
一）单句改错。
1. When people talk about Hangzhou, the first comes to mind is the West Lake.
2. In the distance there is a hill, on the top of it stands a white temple.
3. I have never been to Dalian which is said to be an attractive city.
4. The sun gives off light and warmth, that makes it possible for
plants to grow.
5. In an open boat, the four men, one of them was a doctor, met with a storm on the sea.
二）用适当的关系词填空。
1. I,________ is your good friend, will of course try my best to help ________ you out.
2. He reached London in 1996,________ , some time later, he became a famous actor.
3. Mr Green will come to the party on Sunday, ________ he promised to every one of us.
4. The professor has two sons, both of ________ are teaching in the same university.
5. The film brought the hours back to me ________ I was taken good care of in that far away village.
三）把下列汉语翻译成英语。
1． 汤姆努力学习并乐于助人，这正是他父母所期盼的。
2． 他们将乘飞机去昆明，在那里他们将呆两三天。
3． 老人有两个女儿，其中一个是医生。
参考答案:
一、 1.在the first后加that。2. it改为which。 3. 在which前加逗号。 4. that改为which。5. them改为whom。
二、 1. who 2. where 3. which 4. whom 5. when
三、
1. Tom studies hard and is ready to help others, as his parents expect.
2. They will fly to Kunming, where they will stay for two or three days.
3. The old man has two daughters, one of whom is a doctor.
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