eg. She works as a doctor.
As a League member, I'll take the lead in everything. 作为一名团员，事事我都要身先士卒。
eg. The moon travels round the earth once every month which is known to everybody.
As is known to everybody, the moon travels round the earth once every month.
It is known to everybody that the moon travels round the earth once every month. (主语从句)
As we have seen，the focus of medical care in our society has been shifting from curing disease to preventing disease - especially in terms of changing our many unhealthy behaviors, such as poor eating habits， smoking and failure to exercise.
① 时间状语从句(当.....的时候)，eg. As the summer comes, the day becomes shorter and shorter.
eg. As she was not feeling well, we all sold her to stay at home.
③让步状语从句，although 引导的句子可以转换成as 的用法。
eg. Although she may fail....
Fail as she may
eg. Although the graph is simple.
Simple as the graph is.
eg. Although he is rich , he doesn't have any friends.
Rich as he is, he doesn't have any friends.
eg. Do as the instruction says. 按照说明书上的要求去做。
He came as we expected. 他就像我们所期待的那样来了。
eg. I'm as tall as you.
as long as 只要; such as 例如 ; as soon as 一....就...... ; so as to 为了;as if 好像;
as though 好像; just as 正如;
You can go where you like as long as you getback before dark.
你可以去你任何想去的地方，只要你在天黑之前回来。(as long as 引导条件状语从句)
He talks as if he knew all about it.
他谈起这件事来就好像什么都知道似的。(as if 引导方式状语从句，从句中常用虚拟语气)
It is just as I told you. 情况正如我跟你说的一样。(just as引导表语从句)
1、尽管他们很小， although they are small / small as they are
2、你所描述的这种人(Such people as you described) are rare nowadays.
3、This basket is 和那个一样的大(as big as that one)。
1. As the words begin to flow, the ideas will come out from the shadows and let themselves be captured on your notepad or your screen.
2. Most likely, you will believe that this will take more time than you actually have and you will end up staring blankly at the pages as the deadline draws near.
It is known to everybody that
It is…that… 形式主语，强调句型
eg. It is in 1998 that I came to Beijing.
It is clear that I came to Beijing. 我来到北京这件事是显而易见的。(形式主语)