1. as与such连用，这时as = who/which。
I have never heard such a story as you tells .
我从来没有听到像你讲的这样的故事。
He is not such a fool as he looks .
他不像看上去的那么傻。
Such women as knew Tom thought he was handsome.
认识汤姆的妇女们都认为他很帅。
2. as与the same连用。
She wears the same kind of clothes as her mother usually does.
他穿着她妈妈通常穿的那种衣服。
Yesterday I bought the same dictionary as you have.
昨天我买了你有的那种辞典。
3. as和which都可以引导定语从句，先行词是整个主句或者主句的一部分。
She was quite right, as Harry soon discovered.
正如哈里很快发现的那样，她完全正确。
Taiwan is , as you know, an inseparable part of China.
你们都知道，台湾是中国不可分割的一部分。
注意：
1）as从句经常可以放句首，而which从句不能放句首。
As everyone knows, Taiwan belongs to China.
大家都知道台湾属于中国。
2）当主句是否定句时，多用as引导从句。
Greenland was not a continent, as people thought.
格陵兰并不像人们所想像的那样是一个大洲。
3）as意为“正如”，而which意为“这一点”。
4）当从句的谓语是see或know时，多用as引导从句。
He is an American, as I know from his accent.
他是美国人，我从他的发音就能听出来。
5）当从句是被动语态时，多用as引导从句。句中的as从句也不能用which来代替。
As is reported in the newspapers, talk between the two countries are making progress.
正如报纸上报道的那样，这两国之间的谈判正在取得进步。
专项练习
1. _______ is known to everyone, the moon travels round the earth once every month.
A. It
B. As
C. That
D. What
2. _______ is mentioned above, the number of the students in senior high schools is increasing.
A. Which
B. As
C. That
D. It
3. _______ is known to all, China will be an _______ and powerful country in 20 or 30 years' time.
A. That; advancing
B. This; Advanced
C. As; advanced
D. It; advanced
4. Also rail travel is very safe and I am never sick on a train, _______ I am on a ship!
A. when
B. while
C. as
D. and
5. _______ is reported in the newspapers, talks between the two countries are making progress.
A. It
B. As
C. That
D. What
6. Robert is good at English, _______ we all know.
A. because
B. which
C. as
D. since
答案速查 1—6 BBCCBC
