Those who are willing to attend the party, sign here please.
（1）先行词一般是名词和不定代词，如:some-, any-, every-和no与-boy, -thing的合成词；或all、none、any、some、that、those等代词。数词也可以作先行词，人称代词也同样可作先行词。
This is the place which is worth visiting.
There are many places we can visit（them）in China.
关系代词：who, whom, which, that, whose, as。
关系副词：when, where, why。that偶尔也作关系副词。
（1）先行词被①形容词最高级 ②序数词 ③数词几种词修饰或被 ④only、any、few、little、 no、all、one of等修饰时。
He was looking pleasantly at te children and parcels that filled his bus.
The village is no longer the one that was 5 years ago.
Which are the books that you bought for me ?
Who is that girl that is standing by the window?
Do you know Mr.Smith whose story is very moving ?
There is a room, whose window faces the river.
There is a room, the window of which faces the river.
（1）先行词被such和the same修饰，或句型as many（much）中，从句都用as 引导。
Such books as you bought are useful.
The school is just the same as it was 10 years age.
注意：区别①such … that … 引导的结果状语从句。They are such
lovely children that we love them much.②the same … that … 引导定语从句。I want to use the same tool that you used just now.
区别：①意义上：as 含有“这点正如……一样”。②位置上：as 从句可置句首，也可在另处。
He didn’t pass the exam, as we had expected.
There is lots of air in loose snow, which can keep the cold out.
As is known, the earth is round, not flat.
when 指时间 = in / at / on / during which
where指地点 = in / at / from / which
why指原因 = for which
I don’t like the way that / in which / he talks.
This is the first time I have given you a lesson in French.