非限制性定语从句。
非限定性定语从句：非限定性定语从句的作用是对所修饰的成分作进一步说明，通常和主句间用逗号隔开，将从句拿掉后其他部分仍可成立。
引导非限制性定语从句的关系代词有as，which，who， whom，whose等，作定语从句的主语、宾语、表语及定语。关系副词有when，where等，作定语从句的状语。关系代词和关系副词在定语从句中一般不能省。
一。 which引导的非限定性定语从句来说明前面整个句子的情况或主句的某一部分 ，这时从句谓语动词要用第三人称单数。that不能用于引导非限制性定语从句。
1 .he seems not to h**e grasped what i meant, which greatly upsets me.
2. liquid water changes to vapor, which is called evaporation.
液态水变为蒸汽，这就叫做蒸发。
3．dorathy was always speaking highly of her role in the play，，of coursemade theothers unhappy．
a．who b．which c．this d．what
二。 有时as也可用作关系代词。
一、as引导非限制性定语从句时，可以代主句的全部或部分内容。常表说话人关于说话的依据、态度、评论、看法等。有“正如、像”等意思。
定语从句可以置主句句首、句中或句末。as后常接expect，know，report，say，see等动词的主、被动语态句。
1． _is known to everybody，the moon tr**els round the earth once every month．
a．it b． as c．that d．what
2．mike，as we expected，attended the meeting．
3．he wasn't unconsicious，as could be judged from his eyes．
他并未失去知觉，这从他的眼神可以判断出来。
三、as，which是指代主句内容的非限制性定语从句时，表依据、评论与表事实、状态等没有多大差别，又在主句末时，有时可以通用。
1．he is quite pleased，as ／which can be seen from his face．
2．you always work hard，as ／which everyone knows．
但是，上面两句把定语从句置主句句首时，就只能用as。
3．this elephant is like a snake，as anybody can see．
4．bamboo is hollow，which makes it very light．
注意：在否定意义的非限制性定语从句里，一般用which引导。
5．he came to my birthday party，which i didn't expect at all．
我完全没有想到，他来参加我的生日聚会了。
非限制性定语从句练习。
1. i’m taking some weight-loss pillsare quite popular here.
a. thatb. which c. whod. which/that
2. his daughteris in beijing now, is coming home next week.
a. which b. thatc. whom d. who
3. my cousinbody is slim, still wants to lose some weight.
a. whom b. thatc. whose d. which
4. my pills are in the bathroom, _i always keep them.
a. which b. where c. thatd. who
5. we’ll put off the outing until next month, _amy feels better.
a. whenb. where c. which d. that
6. my unclei told you about yesterday, is an engineer and is working in beijing.
a. which b. whoc. whom d. who/whom
7. he passed the examsurprised all of us.
a. which b. whoc. whom d. that
8. jim changed his mind, _made me very angry.
a. whob. whom c. which d. that
9. after living in paris for fifty years he returned to the small town, _he grew up as a child.
a. which b. where c. thatd. when
10. you can find whatever you need at the shopping center, _is always busy at the weekend.
a. thatb. where c. whatd. which
11. uncle tom lives in a mountainous village, _is two hours’ ride from here.
a. where b. in which c. which d. that
12. i’m le**ing for taiyuan on sundayhappens to be my birthday.
a. whenb. thatc. which d. it
13. it was raining he**ilykept me indoors the whole day.
a. thisb. thatc. which d. who
14. mike, _hobby is tr**elling, has decided to visit the great wall next month.
a. whose b. thatc. which d. who
15. recently i bought an ancient chinese vasewas very reasonable.
a. which priceb. the price of which
c. its priced. the price of whose
16. i h**e many friendssome __are businessmen.
a. from whom b. of whom c. from which d. of which
17. china has lots of islands, one __is taiwan.
a. of which b. of that c. from which d. from that
18. he paid the boys 10yuan for washing ten windows, most of __hadn’t been cleaned for at least a year.
a. whom b. thatc. which d. those
19. mr. kuxun, some of __works(作品) we had read, was one of the greatest writers in the world.
a. hisb. whose c. whom d. which
20. the journey around the world took the old sailor nine months, _the sailing time was 226 days.
a. of which b. during which c. from which d. for which
21. madam curie, for __life had been very hard early in her life, was the first person in the world to receive two nobel prizes.
a. whose b. which c. thatd. whom
22. she was educated at beijing universityshe went on to h**e her advanced study abroad.
a. after which b. from which c. from that d. after that
23. the manyou borrowed the cinema, has left for shanghai.
a. from which b. from whom c. from that d. to who
24. i was given three books on cooking, the first __i really enjoyed.
a. of that b. of which c. thatd. which
25. a scientist has made another wonderful discovery about human genes, _of great importance to science.
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