as 作连词
1.当...的时候
He rose as she entered.
当她进来的时候，他站了起来。
2.因为
As Davidson had a passion for walking, we started off on foot.
因为戴维逊很想走走路，所以我们就步行启程了。
3.既然
As you are sorry, I'll forgive you.
既然你有认错之意，我就原谅你啦。
4.按照
I have changed it as you suggest.
我按照你的建议作了一些修改。
5.像
Do as I do it.
像我作的方法再作一下。
6.正如
As he knew, she wasn't much at letter-writing.
正如他所知道的，她不太善于写信。
这里举的例子都是as接状语从句。