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1.第一种:As可以引导定语从句.有时可译为“正如”.此时,常常是as从句在前,主句在后。例如:As we can see,he is a Chinese.
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2.第二种:As 还可引导原因状语从句,“因为,由于“。例如:As he is so lazy,he never cooks by himself.
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3.第三种:As还可引导时间状语从句,“当,随着”。例如:As the weather is colder and colder,the leaves of the tree is less and less.
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4.第四种:As还可引导方式状语从句,“按照”。例如:You must do the work as I have told you.