As的用法小结
-
As
的用法小结
<
/p>
as
可以作连词、介词及关系代词和副词。现将其用法小结如下<
/p>
:
（一）、
as
作连词的用法
:
1.
作
“<
/p>
在
-------
期间，当
----
的时候
”
引导时间
状语从句
.
注意与
when
、
while
的用法区别。
①下列情形时
,
只用
as,
而不用
when
或
while
。
1)
用于表示同一个人的两种动作交
替进行
,
指一边
----
一边
.
如
:
The girl sings as she goes
to school.
He looked behind
occasionally as he went forward in the forest.
2)
表示两个同步发生的动作或行为
,
意思是随着
-----
的发展
.
如
:
As time went on / by, she
became more and more beautiful .
As children get older, they become more
and more interested in everything.
3)
表示两个短暂行为或事情几乎同时发生
.
如
:I watched her as she read
the book.
I thought of it
just as you opened your mouth.
Just as the flying worm hit her face,
she gave a loud cry.
4)
接在名词后面表示某一个年龄段时
.
如
:
As a young man, he
was active in sports.
②
when
作
当
……
的时候
解
,
可以指较短的
(
一点
)
时间
,
也可
指一段时间。如
:When I was at college, I could
speak
several foreign languages. When
the clock struck twelve, I had slept for 2hours.
③
whi
le
常表示一段较长的时间或一个过程
,
强调主句谓语动词与从句谓语动词同时发生。如
:Work while you
work. Play while you play.
2. As =Since
作
既然
、
由于
解
,
< br>引导原因状语从句
,
常用来表示已为人们所知或显而易见
的原因或理由。如
: As
he’s been ill
for ages, I will hel
p him.
As / Since you're not feeling well, you
may stay at home.
As he
wasn't ready , we went without him.
3. As =in the way that
作
像
、
按照
……
的方式
< br>
解
,
引导方式状语从句。如
:
Do as I told
you.
Remember, you must do
everything as I do.
4.
用于
as---
as
或
not / so/ as ---- as
中
,
前一个
as
是副词
,
后一个
as<
/p>
是连词
,
引导比较状语从句。
如
:They helped
the old
as much as possible.
I
don't speak English so/ as well as she does.
5.
表示虽然
,
尽管
等
,
引导让步状语从句
,
常用倒装语序
,
模式为
:
adj. /adv. / n.+as +
主语
+
谓语
+
主句。如
: Young as he is, he knows much.
Tired as they were, they
walked on.
6.
表示
也
------
一样。
She is a doctor, as was her husband.
（二）、
as
作关系代词
,
引导定语从句
,
表示正如
,
这一点
.
如
:
He is very careful, as we all know.
As is well-known, Taiwan
belongs to China.
另外
,
当先行词被
the same, such
等词修饰时
,
常用
as
来引导定语从句。如
:
Such a clever girl as she can learn
anything quickly.
I was
reading the same book as he bought yesterday.
（三）、
as
作介词的用法
.
1.
表示好像。如
:He
dressed as a policeman.
2.
表示作为当作。如：
I found a job as a
guide.
3.
当某人是某身份时。如：
As a child , she
was sent to abroad.
4. as
引导的介词短语大多用作状语
,as
译为<
/p>
作为
少数情况可
引起宾语补足语。如
:
As a
Party member, I'll take the lead in everything.
(
状语
)
She works as a model.
(
状语
)
She has me as one of her best
friends.(
引起宾语补足语
)
（四）、作副词的用法
1
表示与
------
等同。如：
This dress is twice as
expensive as that one. 2
像，如等。如：
As before, he
remained unmoved.
总之，通过以上的分
析，我们对
as
的词性和用法有了比较全面的理解和把握，才能
在实际的运用
中做到心中有数，应付裕如。
一）
as
作副词，表示程度，意为
“
同样地
”
。在
“as
．<
/p>
．
．
as
．
．
．
”
，
“not as
．
．
．
as
．
．
．<
/p>
”
结构中的第一个
as
< br>是副词，作
“
和／与．
．
．
(
不
)
一样
”
解。
eg
：
Jack is
as tall as his
father
．杰克和他的父亲一样高。
He doesn't speak English
as
／
so fluently as
you
．他的英语说得不如你流利。
二）
as
作介词。
1
．作
“
如，像
”
解。
eg
：
They got united as one
man
．他们团结得像一个人一样。
2
．作
“
充当
，作为
”
解。
eg
：
As a
writer
，
he was
famous
．作为作家，他是很有名的。
三）
as
作
连词，常用来连接主句和状语从句。
1
．引导时间状语从句，作
“
当．<
/p>
．
．的时候
”
解
，有
“
随着．
．
．
”
之意，与
while
意义相近，强调两个动作同时发生；
或某事一发生，另一事立即发生。
eg
：
He shouted aloud as her ran
along
．他一边往前跑，一边高声地呼喊。
I was startled as he opened
the door
．他一开门，我吓了一跳。
as
作连词，相当于
when
。
eg
；
As a little boy
(When he was a little boy)he began to learn to
play piano
．他小时候就开始学弹钢琴。
2
．引导原因状语从句，作
“
因为，由于
”
解，与
because
的用法相近。
eg
；
I
must stop writing now
，
as I
have rather a lot of work to
do
．我必须停笔了，因为我还有许多工作要做。
3
．引导方式状语从句或比较状语从
句，作
“
正如，
(
如
)
像
”
解。例
eg
：
As in your
country
，
we grow wheat in the
north and rice in the south
．正如
(
像
)
你们国家一样，我们在北方
种小麦，
在南方种大米。
(
方式状语从
句
)
When at
Rome
，
do as Romans do
< br>．入乡随俗。
(
方式状语从句
)
4
．引导让步状语从句，作
“
虽然，尽管
”
解。这
时从句常用倒装语序，即把从句中的表语、状语或动词原形放在
as
之前。
eg
；
Strange as it may
seem
，
it is
true
．尽管这事看上去很奇怪，但却是真的。
Try as he
might
，
Tom could not get out
of the difficulties
．不管怎样努力，汤姆还是摆脱不了困境。<
/p>
四）
as<
/p>
作关系代词。
1
．引导限制性定语从句，用在
“such
< br>．
．
．
as”,“the sa
me
．
．
．
a
s”
，
“as
．
．
．
as”
等结构中，常译作
“
像．
．
．一样的人
(
或
物
)”<
/p>
，
“
凡是．
．<
/p>
．的人
(
或物
)
”
。例
eg
：
He wished to be such a man as Lei Feng
was
．他曾希望做一个像雷锋那样的人。
My hometown is no longer
the same as it
was
．我的家乡再也不像过去一样了。
2
．引导非限制性定语从句，用来指
代它前面的整个句子
(
即先行句
)
，意思是
“
这一点
”
。这个分句可以位于句首、
句中或句末。
eg
：
As is well
known
，
oceans cover more than
70
％
of the
earth
．我们知道，海洋占地球面积的百分之七十以上。
五）含
as
的固定词组的用法
1
．
as soon as
作
“
一
…
就
”
解，引导时间状语从句。
eg
：
As soon as I get to
Beijing
，
I'll write to
you
．我一到北京，就给你写信。
2
．
as
／<
/p>
so long as
作
“
只要
”
解，
eg
；
As
／
So long as you
study hard
，
you'll make
progress
．只要你努力，你就会取得进步。
3
．
as
if
／
though
常用来引导方式状
语从句，作
“
好像，仿佛
”
解。如果从句中讲的是非真实情况，则用虚拟语气。
eg
< br>：
She loves the child as
if
／
though he were her
own
．她爱这个孩子如同爱自己的孩子。
As if
／
though
也可用来引导表语从句，常用在
“It app
ears
／
looks
／
seems
．
．
．
+as if
／
though”
句型结构中。
eg
；
It appears as
if
／
though it is going to
clear up
．看起来天要晴了。
It seems as
if
／
though he knew nothing
about it.
他好像对此事一无所知。
4
．
as
to
作
“
关于，至于
< br>”
解。
eg
；
< br>
There is no doubt as to his
honesty
．他的诚实是无可置疑的。
5
．
as
much
／
many as
作
“
多达．
．
．
”
，
“
达到．
．
．之多
”
解。
eg
：
He can earn as much as 5000 dollars a m
onth
．他每月能挣
5000
美元。
6
．
so<
/p>
／
as far as I know
作
“
就我所知
”
解，在句中作插入语。
eg
：
As
／
So
far as I know
，
he will come
here next
Monday
．据我所知，他将于下星期一到这里来。
7
．
as
a result
，
as a result of
表示
“
由于．
．
．的结果
”
。
eg
：
She
died as a direct result of the
accident
．她的死是那次事故的直接结果。
8
，
as
well
为
“
也，还
< br>”
之意。
eg
：
Come
early
，
and bring your brother
as well
．早点来，把你的弟弟也带来。
9
．
so
as to
，
so
．
< br>．
．
as to
若跟动词原形，
表示目的或结果。
eg
：
He studied hard so as to
pass the exam
．他努力学习以便通过考试。
(<
/p>
表示目的
)
as
用法小结
一）
as
作
副词，表示程度，意为
“
同样地
”
。在
“as
．
．<
/p>
．
as
．
．
．
”
，
“not
as
．
．
．
a
s
．
．
．
”<
/p>
结构中的第一个
as
是副词，作
“
和／与．
．
．
(
不
)
一样
”
解。
eg
：
Jack is as tall as
his father
．杰克和他的父亲一样高。
He doesn't speak English
as
／
so fluently as
you
．他的英语说得不如你流利。
二）
as
作介词。
1
．作
“<
/p>
如，像
”
解。
e
g
：
They got united as one
man
．他们团结得像一个人一样。
2
．作
“
充当
，作为
”
解。
eg
：
As a
writer
，
he was
famous
．作为作家，他是很有名的。
三）
as
作
连词，常用来连接主句和状语从句。
1
．引导时间状语从句，作
“
当．<
/p>
．
．的时候
”
解
，有
“
随着．
．
．
”
之意，与
while
意义相近，强调两个动作同时发生；
或某事一发生，另一事立即发生。
eg
：
He shouted aloud as her ran
along
．他一边往前跑，一边高声地呼喊。
I was startled as he opened
the door
．他一开门，我吓了一跳。
as
作连词，相当于
when
。
eg
；
As a little boy (When he was a
little boy)he began to learn to play
piano
．他小时候就开始学弹钢琴。
2
．引导原因状语从句，作
“
因为，由于
”
解，与
because
的用法相近。
eg
；
I
must stop writing now
，
as I
have rather a lot of work to
do
．我必须停笔了，因为我还有许多工作要做。
3
．引导方式状语从句或比较状语从
句，作
“
正如，
(
如
)
像
”
解。例
eg
：
As in your
country
，
we grow wheat in the
north and rice in the south
．正如
(
像
)
你们国家一样，我们在北方
种小麦，
在南方种大米。
(
方式状语从
句
)
When at
Rome
，
do as Romans do
< br>．入乡随俗。
(
方式状语从句
)
4
．引导让步状语从句，作
“
虽然，尽管
”
解。这
时从句常用倒装语序，即把从句中的表语、状语或动词原形放在
as
之前。
eg
；
Strange as it may
seem
，
it is
true
．尽管这事看上去很奇怪，但却是真的。
Try as he
might
，
Tom could not get out
of the difficulties
．不管怎样努力，汤姆还是摆脱不了困境。<
/p>
四）
as
作关
系代词。
1
．引导限制性定语从句，用在
“such
．
< br>．
．
as”,“the same
．
．
．
as”
，
“as
．
．
．
as”
等结构中，常译作
“
像．
．
．一样的人
(
或
物
)”
，<
/p>
“
凡是．
．
．的
人
(
或物
)”
。例
eg
：
He wished to be such a man as Lei Feng
was
．他曾希望做一个像雷锋那样的人。
My hometown is no longer
the same as it
was
．我的家乡再也不像过去一样了。
2
．引导非限制性定语从句，用来指代它前面的整个句子
(
即先行句
)
，意思是
< br>“
这一点
”
。这个分句可以位于
句首、
句中或句末。
eg
：
As is well
known
，
oceans cover more than
70
％
of the
earth
．我们知道，海洋占地球面积的百分之七十以上。
五）含
as
的固定词组的用法
1
．
as soon as
作
“
一
…
就
”
解，引导时间状语从句。
eg
：
As soon as I get to
Beijing
，
I'll write to
you
．我一到北京，就给你写信。
2
．
as
／<
/p>
so long as
作
“
只要
”
解，
eg
；
As
／
So long as you
study hard
，
you'll make
progress
．只要你努力，你就会取得进步。
3
．
as
if
／
though
常用来引导方式状
语从句，作
“
好像，仿佛
”
解。如果从句中讲的是非真实情况，则用虚拟语气。
eg
< br>：
She loves
the child as if
／
though he
were her own
．她爱这个孩子如同爱自己的孩子。
As if
／
though
也可用来引导表语从句，常用在
“It appears
< br>／
looks
／
seems
．
．
．
+as i
f
／
though”
句型结构中。
eg
；
It
appears as if
／
though it is
going to clear up
．看起来天要晴了。
It seems as
if
／
though he knew nothing
about it.
他好像对此事一无所知。
4
．
as
to
作
“
关于，至于
< br>”
解。
eg
；
< br>
There is no doubt as to
his honesty
．他的诚实是无可置疑的。
5
．
as
much
／
many as
作
“
多达．
．
．
”
，
“
达到．
．
．之多
”
解。
eg
：
He can earn as much as 5000 dollars a m
onth
．他每月能挣
5000
美元。
6
．
so
／
as far as I know
作
“
就我所知
”
解，在句中作插入语。
eg
：
As
／
So far as I
know
，
he will come here next
Monday
．据我所知，他将于下星期一到这里来。
7
．
as
a result
，
as a result of
表示
“
由于．
．
．的结果
”
。
eg
：
She
died as a direct result of the
accident
．她的死是那次事故的直接结果。
8
，
as
well
为
“
也，还
< br>”
之意。
eg
：
Come
early
，
and bring your brother
as well
．早点来，把你的弟弟也带来。
9
．
so as to
，
so
．
．
< br>．
as to
若跟动词原形，表示目的或结果。
eg
：
He
studied hard so as to pass the exam
．他努力
学习以便通过考试。
(
表示目的
)
as...as
的用法
as...as
意为
和
……
一样
，表示同
级的比较。使用时要注意第一个
as
为副词，第二个
as
为连词。其基本结构为：
as+ adj./
adv. +as
。例如：
(1)This film is as interesting as that
one.
这部电影和那部电影一样有趣。
(2)Your pen writes as
smoothly as
mine.
你的钢笔书写起来和我的一样流畅。
其否定式为
not as/so
+adj./ adv. +as
。例如：
This dictionary is not
as/so useful as you
think.
这本字典不如你想象的那样有用。
若有修饰成分，如
twice,
three times, half, a quarter
等，则须置于第一个
as
之前。例如：
Your bag is twice as expensive as
mine.
你的袋子比我的贵一倍。
几个关于
as...as
的常见句型：
(1)
as...as possible
Please answer my question as soon as
possible.
请尽快回答我的问题。
(2)
as...as usual/before
She looks as pretty as
before.
她看起来和以前一样漂亮。
(3)
as long as...
(
引导条件状语从句
)
It took us as long as three years to
carry out the
plan.
我们花了长达三年的时间才完成这项计划。
(4)
as far as
He
walked as far as the railway station yesterday
evening.
昨天傍晚，他一直散步到火车站。
(5)
as well as
She
cooks as well as her mother
does.
她烧菜烧得跟她母亲一样好。
一些带有
as...as
结构的常见短语归纳：
as busy as a
bee
像蜜蜂一样忙碌
as easy as ABC
像
AB
C
一样容易
as deep as a
well
像井一样深
as light as a
feather
像羽毛一样轻
as soft as
butter
像黄油一样软
as rich as a
Jew
像犹太人一样富裕
[
解题过程
]
as +
形容词或副词原级
+ as
1
）在否定句或疑问句中可用
so…
as
。
He cannot run so/as fast as you.
2
）当
as… as
中间有名词时采用以下格式。
as
+
形容词
+ a
+
单数名词
as
+ many/much +
名词
This is as good
an example as the other is.
I can carry as
much paper as you can.
3
）用表示
倍数的词或其他程度副词做修饰语时，放在
as
的前面。
This
room is twice as big as that one.
Your room is the same size
as mine.
4)
倍数
+ as + adj.
+ as
<=>
倍数
+ then + of
This bridge is three times
as long as that one.
This bridge is three times the length
of that one.
Your room is twice as large as mine.
Your room is
twice the size of mine.
necessary+for
还是
to?
一般情况下是
+
to,
若是表示“对某人有必要的、是必须的”之意，即
necessary
后面直接跟人称代词，就
+
for
。
看一些例句就知道了：
1
）
Sleep is
necessary to health.
睡眠对健康是必要的。
2
）
Sometimes it is
not necessary to go inside in order to buy the
hamburgers.
有时候要买汉堡包不需要进入这些餐馆。
3
）
It is necessary
for older people to understand what they think and
feel.
年长的人有必要了解年青人在想些什么
,
他们有什么感觉。
“It’s +adj.+of+sb.+to
do”和
“It’s+adj.+for+sb.+to
do”区别
It is+adj.+of sb. +to
do sth
中的
adj.
跟
sb.
有关
,
这个
adj.
是用来形容
sb.
的
,
表示某人这么做真是太
< br>adj.
了．
你会发现在这
个句型中你把
sb.
和
adj.
提出来可以造个句
sb. is(are) adj.
如
It's very kind of you to
help me.
把里面的
sb.
和
adj.
提出来可以发现
you
are kind
是说得通的
.
而
It is +adj.+for sb.+to do
sth
表示做某事对某人来说很
adj.
< br>这里的
adj.
是
do
sth.
的属性
里面的
sb.
跟
adj.
没有直
接联系