1、Unit 4 Natural DisastersDiscovering Useful Structures学习目标掌握本节句型表达与运用。句式剖析定语从句一、定义1.在主从复合句中，对某一名词或代词起修饰作用的从句叫定语从句。被修饰的名词或代词叫先行词，引导定语从句的词叫关系词。2.关系词分为关系代词(that，which，who，whom，whose，as等)和关系副词(when，where，why等)两类。二、关系代词引导的定语从句1.who引导的定语从句合作探究The children who were injured in the car accident are being trea
2、ted in the hospital now.目前，在车祸中受伤的孩子们正在医院接受治疗。Danny was the man who we rescued from the ruins.丹尼是我们从废墟中救出来的那个人。自主发现1who指人，在定语从句中可以充当主语、宾语。2.whom引导的定语从句合作探究Rose is the person (who/whom) you should care about.罗丝是你应该关心的人。The boy(whom) the teacher often praises is their monitor.老师经常表扬的那个男孩是他们的班长。自主发现2wh
3、om指人，在定语从句中作宾语，可省略，也可用who代替。3.whose引导的定语从句合作探究I know the person whose house was destroyed in the earthquake.我认识那个人，他的房子在地震中被摧毁了。He lives in a room whose window faces north.他住在一个窗子朝北的房间里。自主发现3whose既可以指人，也可以指物，表示“所属”关系，whose在定语从句中作定语。4.which引导的定语从句合作探究The young man was very happy to get back the gold
4、ring(which) he had lost on the train.那个年轻人领回了在火车上丢失的金戒指，非常高兴。The little girl is having an apple which is big and red.小女孩正在吃一个又大又红的苹果。自主发现4which指物，在定语从句中作主语、宾语，作宾语时可省略。5.that引导的定语从句合作探究The number of people that/who come to visit this city each year reaches one million.每年来参观这座城市的人数达100万。(that指人，作主语)The suitcase that/which lies on the ground is hers.地上放的那个手提箱是她的。(that指物，作主语)自主发现5that既可指人，也可指物，在定语从句中作主语、宾语或表语，作宾语时可以省略。习惯上指人多用who/whom替代，指物多用which替代。名师提醒(1)关系代词指代先行词在定语从句中充当主语、宾语、定语或表语，因此定语从句中不能再出现关系代词所替代的名词或代词。(2)关系代词在从句中作主语时不能省略，作宾语时可以省略。
