as引导状语课件

As的词性及用法1

asconj.adv.pron.prep.固定用法引导定语从句引导时间状语从句引导原因状语从句引导让步状语从句引导方式状语从句引导比较状语从句2一、

as作关系代词,引导定语从句,作"正如"、"这一点"解。如:

He

is

very

careful,

as

his

work

shows.

1.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

boy

as

he

can

learn

anything

quickly.

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。如：

Asiswellknown，oceanscovermorethan70％oftheearth．

3二.as做连词

1.作“当……的时候”,引导时间状语从句。注意与when、

while的用法区别。①

when作"当……的时候"解,可以指较短的(一点)时间,也可指一段时间。②

while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。4③

但属下列情形时,只用as,

而不用when或while。

a)

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

dances

as

she

sings

on

the

stage.

b)表示两个同步发展的动作或行为,译为"随着……"。如:

Asthesunrosethefogdispersed.

5c)表示两个短促行为或事件几乎同时发生。如：

I

thought

of

it

just

as

you

opened

your

mouth.

d)

后接名词表示某一年龄段时,用as。如：

As

a

young

man,

he

was

active

in

sports.

62.

as=since,

作"既然"、"由于"解,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

/

Since

you're

not

feeling

well,

you

may

stay

at

home.

As

he

wasn't

ready

in

time,

we

went

without

him.

73.

as=in

the

way

that,

作"像"、"按照……的方式"解,引导方式状语从句。如:

He

speaks

English

as

Americans

do.

WhenatRome,doasRomansdo.4.

用于as...as...或not

so/

as...as...中,前一个as是副词,后一个as是连词,引导比较状语从句。如:

They

helped

the

old

man

as

often

as

possible.

I

don't

speak

english

so/

as

well

as

he

does.

85.

作"虽然"、"尽管"解,引导让步状语从句。常用倒装语序,把从句中的表语、状语或动词原形放在as之前,即adj.

/adv.

/

n.+as

+主语+谓语+主句。如:

Tired

as

they

were,

they

walked

on.

Child

as

he

is,

he

knows

a

lot.

(child前不用冠词)9三、as作副词表示程度，意为“同样地”用于as...as...或not

so/

as...as...中,前一个as是副词,后一个as是连词,引导比较状语从句。10四、

as作介词的用法:

as引导的介词短语大多用作状语,as译为"作为";少数情况可引起宾语补足语。如:

As

a

league

member,

i'll

take

the

lead

in

everything.

(状语)

She

works

as

a

doctor.

(状语)

They

have

me

as

one

of

their

own

children.(引起宾语补足语)11五、含as的固定词组的用法

1．assoonas作“一…就”解，引导时间状语从句。eg：

AssoonasIgettoBeijing，I‘llwritetoyou．2．as／solongas作“只要”解，eg；

As／Solongasyoustudyhard，you‘llmakeprogress．3．asif／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：

Shelovesthechildasif／thoughhewereherown．

Asif／though也可用来引导表语从句，常用在“Itappears／looks／seems．．．+asif／though”句型结构中。eg；

Itappearsasif／thoughitisgoingtoclearup．看起来天要晴了。124．asto作“关于，至于”解。eg；

Thereisnodoubtastohishonesty．

5．asmuch／manyas作“多达．．．”，“达到．．．之多”解。eg：

Hecanearnasmuchas5000dollarsamonth．6．so／asfarasIknow作“就我所知”解，在句中作插入语。eg：

As／SofarasIknow，hewillcomeherenextMonday．137．asaresult，asaresultof表示“由于．．．的结果”。eg：

Shediedasadirectresultoftheaccident．8，aswell为“也，还”之意。eg：

Comeearly，andbringyourbr