文档介绍：: .
as引导定于从句:
1、as用作关系代词和关系副词引导限定性定语从句，并在从句中做
主语、表语和状语，构成 the same ...as, such...as等结构。
Eg: I have got into the same trouble as you.
2、as引出非限定性定语从句时，代替整个主句，对其进行说明。但
通常用于：（as we all know, as it is known, as is known to all, as it is, as is said above, as always men ti oned above, as is usual, as is often the case, as is reported in the n ewspaper）.
as在非限定性定语从句中作 主语、表语或宾语，且引出的从句位置 比较灵活，可位于句首或句末，也可置于主句中间。通常均由逗号将 其与主句隔开。
as有正如……，就像……”之意。
Eg：
As is known to the United States, Mark Twain is a great American writer.
美国人都知道，马克吐温是一位伟大的美国作家（as在从句中作主语）
He forgot to bring his pen with him, as was ofte n the case.
他忘了带笔，这是常事。（as在从句中作主语）
He is absorbed in work, as he ofte n was.
他正在全神贯注地工作，他过去经常这样。（as在从句中作表语）
As we all know, the earth is round.
众所周知，地球是圆的。（as在从句中作宾语）
The two brothers were satisfied with this decision, as was agreed beforeha nd.
两兄弟对此决定都满意，这项决定在事前都已得到他们的同意。 （as
在从句中作主语）
Taiwa n is, as you know,