7、文科QQ群:492199588一、关系代词引导的定语从句1.who 指人,在定语从句中作主语。①The boys who are playing football are from Class One. ②Yesterday I helped an old man who had lost his way. ③ That is the teacher who teaches us physics. 2.whom 指人,在定语从句中做宾语,常可省略。①Mr Liu is the person ( whom ) you talked ab