As的用法

As的各种用法
一、用作介词。

例如：
（1）As the new manager of the company, Wilcox assured the staff that he would work for the benefits of the company.
二、用作表示“程度”的副词。

例如：
（2）You have performed well. Other students' performance is as good.
三、用作从属连词，引导“比较”副词从句。

例如：
（3）Can our runners run as fast as they used to?
四、用作从属连词，引导“时间”副
词从句。

例如：
（4）As the new teacher entered the classroom, the pupils clapped their hands.
五、用作从属连词，引导“方式”副词从句。

例如：
（5）You may act as you think fit.
这些由"as"引导的从句可以节缩，如：
（6）The meeting will be held as （it has been）scheduled.
六、用作从属连词，引导“原因”副词从句。

例如
（7）As the weather is fine, let's go fishing.
七、用作从属连词，引导“让步”副词从句。

例如：
（8）Young as Sam is, he has performed his task well.
八、用作关系代词，引导形容词从句。

关系代词as的用法是历年大学英语四级统考中的一个重要考点。

它主要有如下两种用法：
一、与such, the same, as连用。

如：
1. It wasn't such a good
dinner_____she had promised us.
A) that B) which C) as D) what
这是1990年1月四级统考题中的第43题，答案为C)。

句意是"那不是如她承诺那样好的一餐。

"
二、引导非限制性定语从句，指代整个主句或主句的一部分。

如：
2. ________is known to the world, Mark Twain is a great American writer.
A) That B) Which C) As D) It
这是1993年6月四级统考题中的第67题，答案为C)。

as指代整个主句, 句意是"全世界的人都知道，马克·吐温是一位伟大的美国作家。

"
3. The British are not familiar with different cultures and other ways of doing things, ________is often the case in other countries.
A) as B) what C) so D) that
这是1998年6月四级统考题中的第58题，答案为A)。

as指代主句的一部分。

其句意是"英国人对与其不同的文化和做事方式不太熟悉，其他国家的人也通常这样。

"
as引导非限制性定语从句时，有以下特点：
1) as引导的从句可置于句首、句
中或句末，如句2中的as从句置于句首，句3中的as从句置于句末。

又如：
4. ________might be expected, the response to the question was very mixed.
A) As B) That C) It D) What
这是1996年6月四级统考题中的第27题，答案为A)。

as从句置于句首。

全句意为"正如所预料的那样，对这个问题的反应各式各样。

"
5. I hope all the precautions against air pollution,
________suggested by the local government, will be seriously considered here.
A) after B) while C) as D) since
这是1999年6月四级统考题中的第53题，答案为C)，as从句置于句中，as后省去了is。

全句意为"我希望，由当地政府提出来的制止空气污染的措施在此能得到认真考虑。

"
6. A good many proposals were raised by the delegates, ________was to be expected.
A) that B) what C) so D) as
这是2003年12月四级统考题中的第42题，答案为D)，as从句置于
句末。

全句意为"不出预料，代表们提出了很多建议。

"
2) as在从句中通常作主语或宾语。

现举as在从句中作宾语的例子如下：
7. This is also part of your job, as I told you before.
as在从句中作told的直接宾语。

全句意为"正如我曾告诉过你的那样，这也是你工作的一部分。

"
8. The size of the audience, as we expected, was well over one thousand. as在从句中作expected的宾语。

全句
意为"正如我们所期待的那样，观众人数大大超过一千人。

"
3) 和as一样，which也能指代整个主句或主句的一部分，引导非限制性定语从句。

如：
9. Some metals are better conductors of electricity than others, ________means that the former have atoms that contain more free electrons than the latter.
A) that B) this C) which D) it
这是1990年6月四级统考题中的第52题，答案为C)，which指代整个主句。

全句意为"一些金属和其
它的金属比起来，是电的更好的导体。

这意味着这些金属的原子含自由电子的数量比其它的金属多。

"
例如：
（17）Is this the same thing as you showed me before?
（18）Y ou can visit such places as you want to.
注意，“as”之前有“the same”或“such”和它挂钩。

九、协助组成短语与句型。

例如：
（19）So as to: They departed early so as to reach the
airport early.
（20）As long as you work hard, you will make it.
As的用法测试题
1. ______ it became more common for women to work outside the house, men began to share housework.
A)As B)Because C)Before D)And 注：表原因时，because语气最强，since其次，as最弱
because表示直接理由。

强调别人未知的事实，而since，as引导的原因状语从句一般表示已知的事实，强调
引起的后果。

例如：
He had to do a part-time job after work because he needed money for his marriage. 他下班后还得兼职因为他结婚需要钱。

Since you know you are wrong, you had better admit it. 既然你知道你错了，你最好赶快承认。

As he couldn't express himself freely, he had to make some gestures. 由于他不能表达自如，只得用手势。

尤其在讯问尚未确定的原因时，必须用because.例如:
Did he buy many books because he was fond of reading?他买许多书是因
为他喜欢看书吗？
b. because引导的从句可以带修饰语just，only，也可以用于强调据或not…but并列结构，但since，as不可以。

例如:
The girl learned to play the piano not because she liked to play the piano but because her parents forced her to. 女孩子弹钢琴不是因为她喜欢弹琴，而是因为她父母强制她学。

It was because he lost it that he found it more valuable than ever. 正因为他失去了它，他才比以往任何时候感到它的宝贵。

(1) 关于because：
语气最强，表示直接原因，可用于回答why 提出的问题、引导表语从句、用于强调句等，而其余三者均不行：
“Why didn’t he come?”“Because he was ill.”“他为什么没来?”“因为他病了。

”
My stomach hurts because I have eaten too many apples. 我肚子痛，因为苹果吃得太多。

That’s because you can’t appreciate music. 这是因为你不能欣赏音乐。

It is because he is honest that I like him. 是因为他诚实我才喜欢他。

(2) 关于since 与as：
a. 两者所表示的原因都是人们已知的，即对已知事实提供理由，而不是表示直接原因。

since 比as 语气稍强，且比as 略为正式，它们引导的从句通常放在主句之前，有时也放在主句之后：
As you were n’t there, I left a message. 由于你不在那儿，我留了个口信。

Since you are wrong, you should apologize. 你既然错了，就应该道歉。

b. since 可用于省略句，而其他三者
不行：
Since so, I have nothing to say. 既然如此，我无话可说。

(3) 关于for：是并列连词(其余三者为从属连词)，它有时可表示因果关系(通常要放在主句之后，且可与because 换用)；有时不表示因果关系，而是对前面分句内容的解释或推断(也要放在主句之后，但不能与because 换用)。

比较：
The ground is wet, for (=because) it rained last night. 地面是湿的，因为昨晚下过雨。

It must have rained last night, for the ground is wet this morning. 昨晚一定下过雨，你看今天早上地面是湿的。

(此句不能用because 代for）
2. He does not speak ______ others do.
A)like B)after C)before D)as
3. ______ they are, atoms are made of still smaller units.
A)Small as B)As small
C)Small but D)But small
4. This basket is ____ big ____ that one.
A)as…then B)so…as
C)a s…as D)no…than
5. _____I know, we shall have a discussion on Thursday.
A)As for B)As far as
C)As long as D)As soon as
6. He spoke ____ he had been here before.
A)as if B)as for
C)as long as D)as far as
7. _____you will, you won’t manage it.
A)Try but B)Try as
C)As try D)But try
8. _____a student, you should attend
all classes.
A)For B)Like C)As D)T o
9. He opposed the idea, ______ could be expected.
A)for B)like C)as D)that
10. Let’s discuss only ____questions ____concern everyone of us.
A)such…as B)so…as
C)as…as D)the same…as
答案
1 a
2 d
3 a
4 c
5 b
6 a
7 b
8 c
9 c 10 a。