2、ys who areplayingfootball arefromClassOne.(2)YesterdayIhelpedanoldman who losthisway.* 2.whom指人,在定语从句中充当宾语,常可省略。(1)Mr.Liuistheperson (whom)youtalkedabout.注意:关系代词whom在口语和非正式语体中常用who代替,可省略。(2)Theman(who/whom )youmetjustnow ismyfriend.* 3.which指物,在定语从句中做主语或者宾语,做宾语时可省略(1)Footballisagame which islikedb
6、etsomefood.我们该做的第一件事是弄点吃的。* 3)当先行词有:theonly,thevery,thesame,thelast等修饰时。例如:Mynecklaceisnot theonly thingthat'smissing.我的项链不仅是丢掉的东西。* 4)当主句以who或which开头时,定语从句中引导词用that,不用which或 who,以避免重复。例如:Who isthegirl that iswearingaredcoat?正穿一件红色外套的女孩子是谁?* 5)当先行词既有人又有物时,用that。例如:Thewriter and hisnovel that youha
7、vejusttalkedaboutarereallywellknown.你刚才谈起的那位作家以及他的小说确实很著名。 2、只用which不用that的情况:* 1)关系代词前有介词时;e.g.Thisistheroom inwhich LuXunlived.* 2) 非限定性定语从句中;作宾语用的关系代词也不能省略。e.g.Thatnecklace, which yougavemeasapresent,wasl