as 从句的先行词是the same, such, 或被他们所修饰；多用于表示肯定意义的从句中，不用于表否定意义的从句中。
e.g. Many of the sports are the same as they were when they started.
The result was not such as he expected.
It was raining hard, which(as) was unexpected.
谓语动词的固定搭配 e.g. This is the evidence with which the case is connected.
先行词 e.g. I’ll never forget the day on which\when I joined the party.
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