as的用法总结及典型句（as用法全析全解）

as可以用作连词，副词，介词，关系代词，是极其重要的高考考点。

1.as conj

①当...时候，一边...一边，随着

He sang songs as he was cutting grass.他一边割草一边唱歌。

As the society develops, our life is getting better and better.随着社会的发展，我们的生活越来越好。

②因为，既然

As he was ill, we decided to go without him.因为他病了，我们决定不带他去。

❊重点提示：because, since, as, for表原因的区别

❆because语气最强，常用于why引导的问句。

--Why didn't you go to the party last night?你昨晚为什么没去参加聚会?

--Because I have something urgent to do.因为我有急事要做。

❆since比because语气弱，常表示对方已知的原因，意思是“既然”

Since everyone is here, let's begin our class.既然大家都到齐了，我们开始上课吧。

❆as与since相似，是明显的或已知的原因，可互换，意思是“由于”。

As you were out, I left a message.因为你不在，我留了一张字条儿。

❆for为并列连词，引导并列分句，语气最弱，表示补充说明的原因。

He must have left, for the light were out.他一定是走了，因为灯都灭了。

③尽管，虽然（引导让步状语从句）

Young as he is, he can speak several languages.他虽然年轻，却能说好几种语言。

❊重点提示：as，though，although，while引导让步状语从句的区别

❆as引导的让步状语从句要用倒装语序，结构为：形容词/名词/副词/动词原形+as+主语+谓语，当名词提前时不加冠词。

Clever as she was, she worked very hard.尽管她很聪明，但她工作很努力。

Child as he is, he set a good example for us.他虽然是个孩子，却给我们树立了好榜样。

Try as he might, he failed the exam again.尽管他尽力了，他考试还是不及格。

Much as I love you, I can't marry you.虽然我很爱你，但我不能嫁给你。

❆though引导的让步状语从句可用倒装语序，也可不用。

❆although，while引导的让步状语从句不能用倒装语序，while引导的从句常放在句首。

While/Although online shopping has changed our life, not all of its effects have been positive.虽然网上购物改变了我们的生活，但并非所有的影响都是积极的。（2016浙江卷）

④像，如同，按照

When in Rome, do as the Romans do.入乡随俗。

Leave my books as they are when I leave.我走的时候，让我的书保持原样。

2.as adv 用于形容词或副词前面，as...as像...一样，如同

He doesn't earn as much as me.他挣得没有我多。

Please run as fast as you can.请尽可能快地跑。

3.as prep

①作为

He worked as a teacher in the high school.他在那所高中当老师。

As a student, we should work hard.作为一名学生，我们应该努力学习。

②像，如同

The boys were all dressed as clowns.男孩们都打扮成小丑。

4.as pron 正如

①such/the same...as，as为关系代词，引导限制性定语从句，在从句中作主语，宾语，表语。

He is not such a poor man as he looks.他并不像看上去那么穷。

The blouse you bought is not the same as I have.你买的衬衫和我的不一样。

②作关系代词，引导非限制性定语从句，as指代整个句子的内容。

As we all know, music plays an important part in our life.众所周知，音乐在我们的生活中扮演着重要的角色。

❊重点提示：as 和which作关系代词，指代整个句子的内容，引导非限制性定语从句的区别：

as意思为“正如”，as引导的定语从句位置灵活，可位于句首，句中，句尾。

which意思为“这，这一点”，which引导的定语从句只能放在句末。

He failed in the exam, which made his parents very worried.他考试不及格，这使他的父母非常担心。