As的用法小结

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:

（一）、 as作连词的用法:

1.作“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.

②when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

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。如:Work while you work. Play while you play.

2. 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 he’s been ill for ages, I will help 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"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"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.

 

第二篇：As的用法小结

1.引导时间状语从句

1),指 “一边…一边…”

The girl sings as she goes to school.

He looked behind occasionally as he went forward in the forest.

2) “随着…的推移/交替”

As time went on / by, she became more and more beautiful.

As children get older, they become more and more interested in everything.

3)表示两个短暂行为几乎同时发生.

I thought of it just as you opened your mouth.

Just as the flying worm hit her face, she gave a loud cry.

(自己联想一下when, while引导时间状语从句时的特点吧)

2. 引导原因状语从句

As =Since "既然"、"由于":

As / Since you're not feeling well, you may stay at home.

As he wasn't ready, we went without him.

(自己联想一下because, for引导原因状语从句时的特点吧)

3. 引导方式状语从句

As =in the way that "像"、"按照……的方式"。如:

Do as I told you.

Remember, you must do everything as I do.

4. as…as…

1) 否定形式 not so …as…

2) + N I cannot afford he asked.

3) +倍数 Our classroom is .

4) as long as

意思一: “和…一样长/长达” I have waited for the news as long as two weeks.

意思二: “只要”---表条件 As long as you work hard, you can probably make certain progress.

5) as far as

意思一: “和…一样远” I walked yesterday, which made me very tired. 意思二: “就…而言”---表观点 As far as I am concerned, smoking is harmful to our health.

6) as well as

意思一: “和…一样好” Lucy sings as well as Lily.

意思二: “和,也”----引导并列的主语要遵循就远原则 He as well as I likes English.

5. 引导让步状语从句“虽然/尽管”

adj. /adv. / n./ V.+as +主语+谓语, ……….

(例句略)

6. 引导定语从句 “正如”

He is very careful, as we all know.

As is well-known, Taiwan belongs to China.

As is often the case with many men, he seems to be having a midlife crisis.

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:

I was reading tHe is a learned professor is welcomed by all the students.

注意:

He is a learned professor 这个句子是such…that…引导的结果状语从句 “如此…以至于….”

7. 特殊句型

………………..as done

I am writing to apply for the post of sales manager in today’s newspaper.

请记住: 只要发现横线后面只有一个单个的过去分词,而此时需要你从4个关系代词中选一个,一定选择as