as大学用法总结？
As的用法小结萊垍頭條
as可以作连词、介词及关系代词和副词。其用法如下:萊垍頭條
一、as作连词的用法:頭條萊垍
1.作“在……期间，当……的时候”引导时间状语从句.垍頭條萊
注意与when、 while的用法区别。萊垍頭條
①下列情形时,只用as, 而不用when或while。頭條萊垍
1) 用于表示同一个人的两种动作交替进行,指一边……一边….垍頭條萊
如:萊垍頭條
The girl sings as she goes to school.萊垍頭條
He looked behind occasionally as he went forward in theforest.條萊垍頭
2)表示两个同步发生的动作或进行，意为随着…..的发展.垍頭條萊
如:萊垍頭條
As time went on / by, she became more and more beautiful.萊垍頭條
As children get older, they become more and moreinterested in everything.垍頭條萊
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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.萊垍頭條
I thought of it just as you opened your mouth.垍頭條萊
Just as the flying worm hit her face, she gave a loudcry.萊垍頭條
4)接在名词后面表示某一个年龄段时.如:萊垍頭條
As a young man, he was active in sports.萊垍頭條
②when作"当……的时候"解,可以指较短的(一点)时间,也可指一段时间。萊垍頭條
如:When I was at college, I could speak several foreignlanguages. When the clock struck twelve, I had slept for 2hours.萊垍頭條
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. Playwhile you play.萊垍頭條
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。萊垍頭條
如: As he’s been ill for ages, I will help him.萊垍頭條
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As / Since you're not feeling well, you may stay at home.垍頭條萊
As he wasn't ready , we went without him.頭條萊垍
3. As =in the way that作"像"、"按照……的方式"解,引导方式状语从句。萊垍頭條
如:條萊垍頭
Do as I told you.條萊垍頭
Remember, you must do everything as I do.萊垍頭條
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。頭條萊垍
如:They helped the old as much as possible.條萊垍頭
I don't speak English so/ as well as she does.頭條萊垍
5. 表示虽然,尽管 等,引导让步状语从句,常用倒装语序, 如果表语有冠词a/an, 需去掉模式为:萊垍頭條
adj. /adv. / n.+ as +主语+谓语+主句。萊垍頭條
如: Young as he is, he knows much.條萊垍頭
Tired as they were, they walked on.萊垍頭條
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Great scholar as he is, he is lacking in common sense.萊垍頭條
6. 固定句型：“主句，as +be/do+主语”表示也…一样。頭條萊垍
如: She is a doctor, as was her husband.萊垍頭條
二、as作关系代词,引导定语从句,表示正如、这一点…萊垍頭條
如:條萊垍頭
He is very careful, as we all know.萊垍頭條
As is well-known, Taiwanbelongs to China.萊垍頭條
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:萊垍頭條
Such a clever girl as she can learn anything quickly.條萊垍頭
I was reading the same book as he bought yesterday.萊垍頭條
三、as作介词的用法.垍頭條萊
1.表示好像。條萊垍頭
如:He dressed as a policeman.頭條萊垍
2. 表示作为当作。垍頭條萊
如：I found a job as a guide.萊垍頭條
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3. 当某人是某身份时。頭條萊垍
如：As a child , she was sent to abroad.萊垍頭條
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。垍頭條萊
如:萊垍頭條
As a Party member, I'll take the lead in everything. (状语)垍頭條萊
She works as a model. (状语)頭條萊垍
She has me as one of her best friends.(引起宾语补足语)頭條萊垍
5. 与某些动词搭配，表示“把……当作……”垍頭條萊
如：look on...as..., regard...as..., treat...as...,consider...as..., think of...as..., see...as...等。其中consider...as...中的as可以省略。as与famous或known搭配，表示“作为……而出名”。萊垍頭條
四、作副词的用法頭條萊垍
1. 表示与…等同。萊垍頭條
如：This dress is twice as expensive as that one.萊垍頭條
2. 像，如等。頭條萊垍
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如：As before, he remained unmoved.萊垍頭條
五、用在习语中的as萊垍頭條
由as构成的习语很多，常见的有：萊垍頭條
as soon as “一…就”，引导时间状语从句；條萊垍頭
as/ so long as “只要”，引导条件状语从句；as if/though “好像，仿佛”,引导方式状语从句或表语从句；萊垍頭條
as to/as for “至于，就……而言”；頭條萊垍
as much/many…as“多达……”；萊垍頭條
as/so…far as “就…的限度”；萊垍頭條
as a result of “（由于……的）结果”；萊垍頭條
as a matter of fact“事实上”；萊垍頭條
as well “也，还”；萊垍頭條
A as well as B“不但A而且B” ；萊垍頭條
as it is“照现状看，看样子”，等等萊垍頭條
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关系代词作定语从句主语时的省略萊垍頭條
关系代词在定语从句中除作宾语可以省略外，在下列情况下，作主语也可以省略。1．定语从句中含there be，作定语从句主语的关系代词可以省略。萊垍頭條
如：You must make a list of the names of the students thereare in your class．頭條萊垍
你必须列一张你班同学的名单。萊垍頭條
He showed me thedifference there is between what is right and what is wrong．垍頭條萊
他给我指出了对和错的不同之处。萊垍頭條
2．主句以there be开始，作定语从句主语的关系代词可以省略。萊垍頭條
如：There is something keeps worrying me．頭條萊垍
有些事一直使我担心。條萊垍頭
There is a teacherhere can speak Spanish．萊垍頭條
这里有一位老师能说西班牙语。萊垍頭條
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3．主句以that is／was开始的句子中，作定语从句主语的关系代词可以省略。頭條萊垍
如：That's all is today's homework．垍頭條萊
今天的家庭作业就是这些。（all后省去that）垍頭條萊
Was that someoneposted your letter？萊垍頭條
是有人帮你把信寄走了吗？（someone后省去that）條萊垍頭
4．主句以here is，here are开始，作定语从句主语的关系代词可以省略。萊垍頭條
如：Here is theprofessor comes from the Oxford University．頭條萊垍
这是从牛津大学来的一位教授。（professor后省去who）條萊垍頭
Here are three orfour of us got a full mark in the examination．萊垍頭條
我们这里三四个人考试得了满分。（us后省去who）垍頭條萊
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5．主语以have（意思是“有”）作谓语，作定语从句主语的关系代词可以省略。萊垍頭條
如：萊垍頭條
I have two morepeople should come to help me．萊垍頭條
我还有两个人应该来帮助我。（people后省去who）條萊垍頭
We have words tospeak to those people will be put to do the work．萊垍頭條
我还有话要对派去做这工作的人说。（people后省去who）萊垍頭條
