非限制性定语从句讲解及练习
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非限制性定语从句\作用：非限制性定语从句只是先行词的附加说明，如果去掉从句，意义仍然完整。
先行词：关系代词：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。
最大的特点：用逗号“，”与主句隔开。
非限制性定语从句举例：His mother, who loves him very much, is strict with him. China, which was founded in 1949, is becoming more and more powerful.什么时候用非限制性定语从句？.当先行词是专有名词或物主代词和指示代词所修饰时，其后的定语从句通常是非限制性的。
Charles Smith, who was my former teacher, retired last year. 查理·史密斯去年退休了，他曾经是我的老师。
My house, which I bought last year, has got a lovely garden.我去年买的的那幢房子带着个漂亮的花园。
This novel, which I have read three times, is very touching. 这本小说很动人，我已经读了三遍。
非限制性定语从句中的五个不能一、非限制性定语从句通常不能用that引导。
如：1. I like the book, which was bought yesterday. 我喜欢这本书，这是昨天买的。
2. I like the book which / that was bought yesterday. 我喜欢昨天买的那本书。
二、非限制性定语从句不能用why引导。
要用for which代替why。
如：1. I had told them the reason, for which I didn't attend the meeting. 我已经把理由告诉了他们，为此我没有去开会。
2. I had told them the reason why I didn't attend the meeting. 我告诉了他们我不去开会的理由。
(限制性定语从句“the reason why...”是常见搭配。
)三、非限制性定语从句置于句首时，不能用which引导。
关系代词as引导非限制性定语从句位置比较灵活，可以放主句前，也可以放主句后。
如：1. As I expected, he didn't believe me. 正如我所预料的，他不相信我。
2. She heard a terrible noise, which brought her heart into her mouth. 她听到一个可怕的声音，这让她把心都提到嗓子眼了。
四、非限制性定语从句由“介词+关系代词”引导时，其中的关系代词不能用as。
如：1. He bought the car for more than $20,000, with which his father was angry. 他花两万多美元买了这辆车，他父亲对此很生气。
2. I finished my work ahead of time, after which I sat some time reading the newspaper.我提前干完了我的活，随后我坐着看了一会儿报纸。
五、在非限制性定语从句中，指人的关系代词作宾语时，只能用宾格whom; 不能用who替换，也不能省略。
如：1. Do you know Tom, whom we talked about? 你认识汤姆吗? 我们谈到过他。
五、关系副词when，whereWhen where引导非限制性定语从句时，作定语从句的状语。
when ＝and then，where ＝and there。
why不引导非限制性定语从句。
1.We will put off the outing until next week，when wewon't be so busy．我们把郊游推迟到下个星期，那时我们不会那么忙了。
关系代词as和which 引导的定语从句as 和which 引导非限制性定语从句时，其用法有相同之处，也有不同之处。
具体情况是：1. as 和which都可以在定语从句中做主语或宾语，代表前面整个句子。
如：He is honest, as / which we can see. 他很诚实，这一点我们看得出来。
2. as 引导的非限制性定语从句可以放在主句的任何地方， which 只可放在主句之后。
另外，as 常常有“正如、正像”的含义。
如：As is known to all, China is a developing country. He is f rom the south, as we can know from his accent. 注意：3.当主句和从句之间存在着逻辑上的因果关系时，关系词往往只用which。
如：Tom was late for school again and again, which made his te acher very angry.4. 当先行词受such, the same 修饰时，关系词常用as。
如：He is not such a fool as he looks.以the way为先行词的限制性定语从句通常由in which或that引导，而且通常可以省略。
5. “as” always means: 正如…一样as 引导的非限制性定语从句一些固定句型：1．as has been said before 如上所述2．as may be imagined 正如可以想象出来的那样3．as is well known 众所周知4．as was expected 正如预料的那样5．as has been already pointed out 正如已经指出的那样6．as we all can see 正如我们都会看到的那样在of which/whom之前可以使用表达数量或定位的数词或代词。
1.I am doing different types of exercises, all of _______are quite helpful to my health.2.Many people , some of ______are not overweight , are going on diets.3.There are 54 students in my class, three of ________come from US.英语：非限制性定语从句练习1. The place _______interested me most was the Children's Palace.A. WhichB. whereC. whatD. in which2. Do you know the man _______?A. whom I spokeB. to who spokeC. I spoke toD. that I spoke3. This is the hotel _______last month.A. which they stayedB. at that they stayedC. where they stayed atD. where they stayed4. Do you know the year ______the Chinese Communist Party was founded?A. whichB. thatC. whenD. on which5. That is the day ______I'll never forget.A. whichB. on whichC. in whichD. when6. The factory ______we'll visit next week is not far from here.A. whereB. to whichC. whichD. in which7. Great changes have taken place since then in the factory _______we are working.A. whereB. thatC. whichD. there8. This is one of the best films _______.A. that have been shown this yearB. that have shownC. that has been shown this yearD. that you talked9. Can you lend me the book ______the other day?A. about which you talkedB. which you talkedC. about that you talkedD. that you talked10. The pen ______he is writing is mine.A. with whichB. in whichC. on whichD. by which11.They arrived at a farmhouse, in front of ______sat a small boy. A. whom B. who C. which D. that12.The engineer ______my father works is about 50 years old.A. to whomB. on whomC. with whichD. with whom13.It there anyone in your class ______family is in the country?A. whoB. who'sC. whichD. whose14.I'm interested in ______you have said.A. all thatB. all whatC. thatD. which15.I want to use the same dictionary ______was used yesterday.A. whichB. whoC. whatD. as16.He isn't such a man ______he used to be.A. whoB. whomC. thatD. as。
