非限制性定语从句（描述性定语从句）与先行词关系不是很紧密, 从句只是对先行词的附加说明。如果去掉从句,句子的意思仍然完整。从句和主句之间常用逗号隔开。引导非限制性定语从句的引导词有: which,who,whom where,when,as等。 Her house, which was built a hundred years ago, stood still after the earthquake 她的房子是100年前建造的,在地震后依然耸立。 My father, who is a doctor, is very strict with us. 我的父亲是一名医生,他对我们要求很严格。不能用that引导,且引导词 I went to London, where I spent the summer holiday. 我去了伦敦,在那里我度过了我的暑假。 He puts off the picnic until May 6, when he will be free. 他把野餐推迟到5月6日,那时他将有空。 (1)as和 which都可以引导非限制性定语从句,并在从句中作主语或宾语,指代前面整个句子。 Jane told me she had apologized to Lucy for her mistake, which was a lie. 简告诉我说她已经为自己的错误向露西道歉了,这是一个谎言 As was planned, we finished our project before the holiday.。正如计划的那样,我们在假期前完成了项目 (2)as引导的非限制性定语从句可以放在主句之前或之后,甚至可以插入主句中间; which引导的非限制性定语从句只能放在先行词之后。另外,as有“正如...正像…”的意思。 Children, as is often the case, love their mother 情况常常如此,孩子爱自己的母亲。 As is known to all, China is a developing country 众所周知,中国是个发展中国家。（3）as引导的很多非限制性定语从句可以当作固定搭配,如 as is often the case(通常就是这样),as often happens(事情往往如此), as is known to all(众所周知), as might be expected(正如所预料的那样),as has been said before(如前所述), as is mentioned above(正如上面所提到的) As often happens, however, things don't work out exactly as planned 然而,经常出现的情况是,事情并不会完全按照计划进行。 As might be expected, the response to the question was very mixed. 正如所预料的那样,人们对这个问题反应不一。 As has been said before, reading is a good way of learning English 止如前面所说的,阅读是学习英语的一种好方法。

什么是非限制性定语从句

非限制性定语从句是先行词的附加说明，去掉了也不会影响主句的意思，它与主句之间通常用逗号分开。非限定性定语从句在句既可以修饰先行词，也可用修饰前面的主句。它在句子中是一个独立成分，不受主句的限制，把从句去掉之后主句仍然成立，这也是它会叫做非限定性定语从句。非限制性定语从句与先行词以及主句之间的关系不甚紧密，因而通常要用逗号与主句分隔开。非限制性定语从句例句 1、Have you seen the film Titanic, whose leading actor is world famous. 你看过“泰坦尼克号”这部电影吗，它的男主演可是世界闻名的。 2、My friend, who has served on the International Olympic Committee all his life, is retiring next month. 我有位朋友，他一辈子服务于国际奥林匹克委员会，下个月就要退休了。

什么是非限制性定语从句？

非限制性定语从句是用于补述前面内容的不足或者言犹未尽的先行词。非限制性定语从句和被修饰词之间常常加一逗号，译成汉语时常常译成两句话。例如：

My brother,who is a teacher, can speak German well. 我兄弟德语讲得很好，他是个教师。上句不可以译成：他那个当教师的兄弟德语讲得很好。

什么是非限定性定语从句

回答如下，请指教。

一.非限定性定语从句

定语从句如果用于补述前面主句内容的不足或言犹未尽的词（先行词），而不是用以限定或修饰先行词时，则为非限定性定语从句。这种定语从句如果省去，主句的意思仍然完整、明确。

He often comes to school late,which makes his teacher angry.

She eats too much,which makes her heavier and heavier.

二.限定性定语从句

关系代词或者关系副词所引出的定语从句如有限定或确定先行词的作用，即为限定用法。限定性定语从句是先行词不可缺少的定语。对句意的明确性起着重要的作用。如果省去，往往会使主句的意思不完整、不明确。

The woman who is wearing a red dress is Mrs Green.

The city where I live is beautiful.

三.用法与举例如下：

非限定性定语从句的五个”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。

2. This book, which you can get at any bookshop, will give you all the information you need. 这本书会给你提供所有你需要的资料，它在任何一家书店都能买到。(非限制性定语从句中引导词在从句中作宾语，无论指人还是指物都不能省略。)

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