定语从句用that不用who

定语从句用that不用who
定语从句用that不用who

定语从句用that不用who
必须用that 1.当everything,anything,nothing,all,none充当先行词时.
2.当先行词由every,any,all,some,no,little,few,much等修饰时,that常被省略
3.当先行词前有序数词或最高级修饰时
4.当先行词前有the very,the only,the just修饰时
5.当先行词本身是who,which时
6.当先行词是人物混有时
7.当先行词前有the same修饰,两物为同一物时
8.当先行词在从句中代替人做主补时

定语从句两个都可以用 用哪个关键看语境

who 引导人， 如，
The professor who taught us English is very young.
that 引导物， 如，
The book that has a picture on the cover is mine.
但是，在it is ...that...这种强调句型中，人物也用that 引导。
It is the young professor that taught us English.