1.as 和which都可以在定语从句中作主语,宾语,既可修饰一个词也可修饰前面的整个句子。
A.She accepted his proposal, as(which)was natural.
她接受了她的求婚,这是自然而然的。
B.The boy is pretty handsome, as(which)we can see in our classroom.
这个男孩非常的帅气,正如我们在教室看到。
2.as 在非限定性定语从句中的使用
2.1 as可以放在主句之前,主句之后,也可以放在句中,可以说位置很灵活。但是which常用在主句之后
A.As we know,technology just like a engine to push the development of economics.
众所周知,技术就像是引擎推动着经济的发展。
B.The diva,as you know, is famous throughout the world.
这个女歌剧演唱家,正如你知道的,在全世界都出名。
C.He has stood her up, which I don`t believe.
他没有赴约,这事我不相信。
2.2 as与the same,such 连用时,用as。
A.This is the same phone as I have borrowed from my sister.
这个手机和我向我姐姐借的一样。
B.I have never had such a chance to make a speech as I always imagined.
我从没有这样一个机会去演讲,正如我一直想象的那样。
2.3在从句中谓语动词为被动语态,缺少主语时用as,不用which。
A.Everyone knows that she has left, as was expected.
所有人都知道她又一次离开了,正如我们预料的那样。
as, which 引导的非限定性定语从句
由as,which 引导的非限定性定语从句,as和which可代整个主句,相当于andthis或andthat。As一般放在句首,which在句中。例如:
As weknow, smoking is harmful to one's health.
如我们所知,吸烟有害健康。
The sunheats the earth, which is very important to us.
太阳使地球暖起来,这对我们人类很重要。