Question

定语从句之非限制性定语从句

Answer 1

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。