英语必修 第一册Unit 4 Natural disasters精品课件ppt

这是一份英语必修 第一册Unit 4 Natural disasters精品课件ppt，文件包含Unit4NaturalDisastersPeriod3DiscoveringUsefulStructures配套课件人教2019版pptx、Unit4NaturalDisastersPeriod3DiscoveringUsefulStructures讲义人教2019版docx等2份课件配套教学资源，其中PPT共28页， 欢迎下载使用。

读下列教材原句并感知黑体部分的共性。1．There were deep cracks that appeared in the well walls.2．Tw thirds f the peple wh lived there were dead r injured.3．The number f peple wh were killed r badly injured in the quake was mre than 400，000.4．Sn after the quakes, the army sent 150，000 sldiers t Tangshan t dig ut thse wh were trapped and t bury the dead.
5．Wrkers built shelters fr survivrs whse hmes had been destryed.6．A dctr with whm James used t wrk died in the 2016 earthquake in Ecuadr.7．Mr Li is an architect whse designs fr the new twn have wn praise.8．The supplies which were prvided t the disaster area were cllected frm arund the cuntry.
在复合句中，修饰某一名词、代词或整个主句的从句叫作定语从句。定语从句是用来充当句中定语的从句，它主要用于修饰句子中的名词、代词，其位置位于被修饰的名词、代词之后。在被修饰的名词、代词与定语从句之间往往有一个关系词将其前后两部分联系成一个整体，关系词分为两种：关系代词和关系副词。常见的关系代词有：that，which，wh，whm和whse。
探究点1: 关系代词的基本用法1．指人用wh, whm, that; 作主语时用wh，that，且不可省 略；作宾语时可用wh，whm，that，且可以省略。 Yu may have chances t meet new peple wh/that will becme yur lifelng friends. 你可能有机会结识将成为你一生的朋友的新人。(指人，作 主语) In the dark street, there wasn't a single persn (whm) she culd turn t fr help. 在黑暗的街道上，没有一个她可以求助的人。(指人，作宾 语)
2．指物用which，that; 作主语时不可省略；作宾语时可以省 略。 I can well remember the accident that happened n a rainy Sunday afternn. 我清楚地记得在一个下雨的星期天下午发生的那场事故。 (指物，作主语) The dictinary (which/that) I bught last week is very useful and handy. 我上周买的字典很有用。(指物，作宾语)
3．whse既可指人，也可指物。在从句中作定语，whse＋n.相 当于the＋n.＋f whm/which。 This is the scientist whse name(＝the name f whm) is knwn all ver the cuntry. 这就是那位闻名全国的科学家。 Nbdy wants the huse whse rf(＝the rf f which) has fallen in. 没有人想要这个屋顶已坍塌的房子。
4．在从句中作介词的宾语且直接跟在介词后时，指人用whm， 不用wh。指物用which, 不用that。 He is a man frm whm we are all ready t learn. 他是我们大家都愿意学习的人。(作介词宾语，指人用whm) The huse in which Gerge used t live is fr rent nw. 乔治曾经住过的那所房子现在正在出租。(作介词宾语，指物 用which)
用关系代词填空(1)On the edge f the jacket, there is a piece f clth____________ gives ff light in the dark. 在夹克的边缘，有一块可以在黑暗中发光的布。(2)Because f ur effrts, ur daughter Gergia decided t dnate a large bag f tys t a little girl ________mther was unable t pay fr her hliday due t illness. 由于我们的努力，我们的女儿Gergia决定捐赠一大袋玩具给 一个小女孩，小女孩的妈妈由于生病而没能力支付她的假期 费用。
(3)The land is knwn fr a histric site with beautifully clured walls, n _________ are painted the events f the past. 这片土地因有着美丽的彩色墙壁的历史遗迹而闻名，墙壁上 画有过去的事件。
探究点2：用that不用which的情况1．当先行词是all，much，little等不定代词或被这些不定代词修 饰时或先行词是指物的不定代词anything，nthing， smething时。 This is all that I can d fr yu. 这就是我所能为你做的全部事情。 Yu can take any seat that is free. 空着的任何座位你都可以坐。 Have yu taken dwn everything that yur teacher said? 你把老师讲的都记下来了吗？
2．当先行词被序数词或形容词最高级修饰时。 This is the mst delicius fd that I have ever had. 这是我吃过的最美味的食物。3．当先行词被the nly，the very，the last修饰时。 Chatting was the nly thing that interested her. 聊天是她唯一感兴趣的事。4．当先行词既有人，又有物时。 The film star and her film that yu have just talked abut are really well knwn. 你刚刚谈到的那位影星和她的影片是非常出名的。
5．当主句是以wh或which开头的疑问句时，为避免重复而用 that。 Wh is the persn that is standing at the gate? 站在门口的那个人是谁？6．当先行词在定语从句中作表语时。 Shanghai is n lnger the city that it used t be． 上海已不是过去那个样子了。
单句语法填空(1)This is the mst beautiful park _______I have ever visited.(2)We ften talk abut the peple and things _____we remember.(3)I have fund the very pen _______ I lst yesterday.
探究点3：用which不用that的情况1．在定语从句中作介词的宾语，且介词位于关系代词前时。 This is the rm in which he lives. 这是他住的房间。2．引导非限制性定语从句时。 Tm came back, which made us very happy. 汤姆回来了，这使我们很高兴。
3．在限制性定语从句中，如果有两个定语从句，其中一个定语 从句的关系代词是that，那么另一个定语从句的关系代词就 要用which。 Let me shw yu the nvel that I brrwed frm the library which was newly pen. 让我给你看这本从新开的图书馆里借来的小说。
用关系代词填空(1)The huse in _______I used t live has becme a she shp.(2)Have yu ever read the bk，________was written by a yung girl? 
1．关系代词在定语从句中作主语时，定语从句的谓语动词要和 先行词的数保持一致。“ne f＋复数名词”作先行词，谓语动 词用复数形式；“the nly ne f＋复数名词”作先行词，谓语 动词用单数形式。 This is ne f the bks which were written by Charles Dickens.
这是查尔斯·狄更斯所写的书中的一本。 He is the nly ne f the bys in ur class wh has learned French. 他是我们班里唯一一个学过法语的男孩。 注意：which引导非限制性定语从句时，往往代表前面所说的 整个情况。这时which被看作单数，其后的谓语动词应用单数 形式。 He said he was a Frenchman, which was nt true. 他说他是一个法国人，这不是真的。
2．为避免关系词的重复，被关系代词所代替的成分不可在从句 中重复出现。 This is the factry which we visited last Sunday. 这就是我们上个星期天参观过的工厂。(visited后不可加it)3．关系代词的省略。 (1)关系代词作主语时不能省略。 (2)作动词宾语的关系代词，可以省略；作介词宾语的关系代 词，如果不直接位于介词后，可省略，如果直接作介词的宾 语，不能省略。 (3)关系代词which在非限制性定语从句中不能省略。
4．技法：两步并举，关系代词选定不用愁Step 1：寻找先行词，辨别人与物先行词指人时常用wh，whm，that；指物时常用 that, which。Step 2：判断所缺成分，选择关系词当定语从句部分缺少主语、宾语、定语时，要想到分别采用wh(主语或宾语)，that(主语或宾语), which(主语或宾语)，whm(宾语), whse(定语)。
单句语法填空(1)All that can be dne______(have) been dne. 所有能做的都已经做了。(2)The student yu shuld learn frm is the ne ______ studies hard. 你应该向学习努力刻苦的学生学习。(3)He is ne f the students _______ _________ frm Spain. 他是来自西班牙的学生之一。
(4)Tm was late fr class again, ________made his teacher really angry. 汤姆又迟到了，这令他的老师很生气。