Question

as引导的定语从句位于句首时做的不是宾语

Answer 1

as 引导的定语从句位于句首时,as 是关系代词,它可能做宾语,也可能做主语.例如：

1.As we all know,the earth goes round the sun.我们都知道,地球环绕太阳转.此句中 as 做宾语.

2.As is known to all,the earth goes round the sun.众所周知,地球环绕太阳转.此句中 as 做主语.