1. 非限制性定语从句中，as用来代指整个主句，可以翻译为“就像/正如...”。它所引导的定语从句可以放在主句句首/句中/句尾。此用法和which类似。如：As we all know, the sun is bigger than the earth.As is known to us all, the sun is bigger than the earth.2. 在限制性定语从句中，如果先行词被such/so/such/so/the same修饰时，则关系代词一般采用as.如：This is the same bike as I bought yesterday.I haven't bought such a bo
1、as用作介词时，意为“作为，当作”+名词，如：They treated us as honoured guests. As a monitor, you must do better than others.2、as用作副词时，意为“同样，一样”用在“as…as”结构中，否定式“not as/so…as”，如：Is it as diffi
