英语定语从句中that,which,who,那些时候只能用that而不能用后两个?

1)先行词是不定代词：
all,few,little,much,something,nothing,anything等.All that we have to do is to practise every day.
2)先行词被序数词或形容词最高级所修饰.
The first lesson that I learned will never be forgotten.
3)先行词被all,any,every,each,few,little,no,some,等修饰.
I have read all the book (that) you gave me.
4)先行词被 the only,the very,the same,the last 修饰时.
He is the only person that I want to talk to.
5)先行词既有人又有物时.
They talked of things and persons that they remembered in the school.
先行词是表示地点时,要根据从句的谓语动词是及物的还是不及物的.如果是及物的就用that(which),否则用where.
This is the house where he lived last year.
This is the house that (which) he visited last year.

1) 如果先行词是all, much, anything, something, nothing, everything, little, none等不定代词，关系代词一般只用that，不用which。
2) 如果先行词被the only, the very, the same, the last, the best等词修饰，关系代词常用that(指人时，可以用who),
3) 当...

1. 有最高级修饰时

2. 先行词有人有物

3. 有the only

4. 有某些强调时

5. 疑问词是who时

句子不缺成分时