as用于引起定语从句，多和 such连用。
Such people as you decribe are rare nowadays.
你描绘的那种人如今很少见了。
Let's discuss only such question as concern everyone of us.
我们只谈与我们每人都有关的问题吧。
也可用在下面这类句子中：
He oppose the idea, as could be expected.
正如可以预料到的，他反对这个意见。
有时和 same连用：
I have the same trouble as you have.
我和你有同样的困难。
