“as” 用于引起定语从句

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。

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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。