引导从句的关系代词有：who(人，主语), whom(人，宾语), whose(人/物,定语), which(物,主/宾), that(人/物,主/宾)。
引导从句的关系副词有：where(地点), when(时间), why(原因)。
1. 只能用that 的情况：
a． 先行词为all, any, few, no, some, much, little等修饰。
I have done all the work that he told us to do .
The first question that he asked me was hard to answer .
They often talk about things and persons that they remember .
d． 先行词是everything, anything, nothing, none等不定代词。
I remembered everything that the teachers taught me before .
This is the best book that I have read .
f． 先行词被the very, the only, the same修饰。
It is the very book that I am looking for .
g． 先行词是指示代词that, one, those, this, another, all等。
Is this school the one that I saw in the picture ?
h． 主句以who / which开头，定语从句用that 。
who is the girl that spoke to you just now ?
which is the car that was made in China ?
2.引导词when, where和why可用相应的表示时间（in, on, at, during等）、地点（in, on, at等）和原因（for）的介词＋which 表达为介宾结构。
a．I still remember the day when I met her for the first time .
I still remember the day on which I met her for the first time .
b．That is the place where I went when I was a child .teacheray.com
That is the place to which I went when I was a child .
c．May I know the reason why you are late ?
May I know the reason for which you are late ?
a． This is the house where we lived last year .
This is the house which/that we lived in last year .
b． This is the day when we left for Shenzhen .
(we left for Shenzhen句子成分齐全,故用when做时间状语引导)
This is the day which/that we spent in Shenzhen .
Last Sunday they reached Dalian, where a meeting was to be held .
She has two brothers, who are both doctors .
They won the game, as we had expected.( as有按照,正如之意)
They won the game, which we hadn’t expected.( which没有按照,正如之意)
As is well known, he is a famous film star in the 1980s.
( as可位于句首, which不可以位于句首)