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as引导的状语从语都有些什么意思啊?

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as引导的状语从语都有些什么意思啊?
除了当...时,作为,还有表转折或是其他的意思吗?
as引导的状语从语都有些什么意思啊?
1.时间状语从句:
as(当……的时候),as soon as(一……就……),
As / When I came home,I met an old schoolmate of mine.我回家的时候遇到了我的一位老同学.
I’ll ring you up as soon as I get an answer from him.我一有他的答复就给你打电话.
2.原因状语从句
表示原因的状语从句可以由as(由于)
As she was ill,she didn’t come to the party.由于病了,她没来参加晚会.
3.条件状语从句
so /as long as(只要),as/ so far as(就……而言),
As/So long as we don’t lose heart,we’ll find a way to overcome the difficulty.只要我们不灰心,我们就能找到克服困难的方法.
As/So far as I know,he is an expert on DNA.据我所知,他是一个DNA专家.
4.方式状语从句
方式状语从句常由as(与……一样),as if(仿佛),as though(仿佛)等词引导:
Do in Rome as the Romans do.入乡随俗.
Leave things as they are.让一切顺其自然.
She stood at the door as if (=as though) she were waiting for someone.她站在门口,仿佛在等人似的.(由as if或 as though引导的从句中可用虚拟语气)
5.比较状语从句
as(与……一样)
Our country is as big as the whole of Europe.我们的国家同整个欧洲一样大.
The result was not as/so good as I had expected.结果不如我预料的那么好.
6.让步状语从句
连词as也可以引导让步状语从句,但从句中要用特殊语序.如:
Young as he is,he knows a lot=Though he is young 或Young though he is,he….
他虽然年轻,但懂得很多.(though 也有这种用法,可以替换as,但although没有这种用法)
though还可以用作副词,放在句末.如:
It was hard work; I enjoyed it,though.=It was hard work,but I enjoyed it.那工作很苦,但是我喜欢干.