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. 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.
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 dreed as a policeman. 2.表示作为当作。如：I found a job as a guide.
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 dre 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。
aS用法小结（高中英语总结）
1．作介词，表示“作为； 当作”。如：
As a party member, I must be strict with myself．
He works in the school as a teacher of math．
2．作连词，引导方式状语从句，意为“像；按照”。 如： You must do everything as I asked you to．
3．作连词，引导时间状语从句。意为“当„„的时候”。 如：
She sings as she walks．
He came just as I reached the door．
4．作连词，引导原因状语从句。如：
You must hurry up as there is little time left．
5．引导让步状语从句，常用于倒装结构 。如： Hard as he worked, he didn’t pa this examination．
Child as he is, he knows a lot．
6．用作关系代词，引导非限制性定语从句。如： As we all know, the earth is round．
She has been late again, as was expected．
