问题: 关于as的一些知识
As is known to all ...
As we all know...
as 作为引导词，可以在从句中充当什么成分？
此外，它还有什么词性？
解答:
as is known to all ... 的 as 在句中作主语
As we all know... 的 as 在句中作know宾语
as在上面两个句子中 是 关系代词，引导定语从句。
as 还可作连词，引导状语从句，如：
Do it as you like.
He talked as he turned back.
as 还可作介词：作为
He works as a teacher.
还有act as guide 中，应该是act as a guide
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