关系副词引导宾语从句as引导的定语从句
关系副词引导宾语从句
关系副词在意义上常常相当与一个"prep.+which"的结构.
1. When(=at, on, in, during+ which):代替时间名词.做时间状语:
I shall never forget the day when (on which) we moved into our new flat.
2．Where(=in, at+ which):代替地点名词.做时间状语:
This is the place where (at which) John parks his car.
3. Why(=for which):代替指代原因.做原因状语:
She didn't know the reason why (for which) she was dismissed.
英语单词巧记法
用记忆术记英语单词
满分英语单词速记法

as引导的定语从句
(1)引导限定性定语从句.
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,宾语,表语或状语,构成:the...same as, such...as, so...as 等结构.
1) 做主语:
Here are such questions as are often asked by the university students.
2) 做宾语:
This is the same T-shirt as I have bought.
3) 做表语:
She has never seen such a handsome boy as I am.
4) 做方式状语:
She'll do the experiment the same way as I do.
5) 做时间状语:
I came the same day as he left.
6) 做地点状语:
She studies in the same college as he does.
7) 做原因状语:
She didn't believe such reason as he did so.
8) 做结果状语:
Here is so difficult a question as nobody can answer.

(2)引导非限定性定语从句. 
as引导非限定性定语从句时,代替整个主句,对其进行说明.一般用于
as we all know, as is known to all, as it is, as is said above, as already mentioned above, as is usual, as is often the case, as is reported in the newspaper
等句式中.as引导非限定性定语从句中做主语,表语或宾语,且引出的从句位置比较灵活,可位于句首或句尾,也可插如入主句中间.通常由逗号将其与主句隔开.as此时有"正如...","就像..."之意.
1) 在从句中做主语:
As is known to China, Qu Yuan is a great Chinese poet.
2) 在从句中做主语:
He forgot to bring his textbook with him, as was often the case.
3) 在从句中做表语:
She is absorbed in work, as she often was.
4) 在从句中做宾语:
As we all know, the moon is round.

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