who在从句中不可以做
表语who,作为关系代词,可以引导
定语从句,且
先行词是表示人的名词或代词,不可省略。
who做主语:
The student who is answering the question is John. 正在回答问题的那个学生是约翰。
who做宾语,且介词没有提前时,可以用whom代替,介词提前不可用who:
The student who/whom Mr Li is talking with is John.
The student with whom Mr Li is talking is John.