九年级英语上册Unit3Safety语法聚焦三导学课件冀教版.ppt

单元语法聚焦三祈使句,Unit3Safety,教材典句,Lookatthisyellowstar,BrianandJenny!布莱恩、詹妮，看这颗黄色的星星！2.Letmegettheladderforyou.让我给你拿把梯子。3.Dontstandonchairs.不要站在椅子上。,单元语法聚焦三,4.Becarefulwithscissorsandknives!小心剪刀和刀子！5.Neversmokebecauseofmuchpressure!永远不要因为压力大而吸烟！,单元语法聚焦三,语法探究,1.定义祈使句是英语中的基本句型之一，用来表达建议、命令、请求、警告、劝告、禁止等语气。祈使句的主语一般为第_人称，通常可以_。为了使语气更加客气或缓和，可在句前或句末加上_一词。,二,单元语法聚焦三,省略,please,2.构成(1)祈使句的肯定形式一般以_动词或_动词原形开始，也可以以动词let开始。(2)祈使句的否定形式一般在句首加_或_。(3)以let开头的祈使句：肯定句：Lethimcomein.否定句：Dontlethimcomein.或Lethimnotcomein.,单元语法聚焦三,实义,be,dont,never,(4)有些祈使句可用No开头，表示禁止。Nosmoking,please.请不要吸烟。Nophotos!禁止拍照！,单元语法聚焦三,3.拓展(1)祈使句的反意疑问句祈使句的反意疑问句，若陈述部分是否定句，则附加问句只能用willyou。若陈述部分是肯定句，附加问句既可用willyou，也可用wontyou。lets开头的祈使句用于提出建议，包括对方，其附加问句用shallwe。letus开头的祈使句表示征求对方许可，其附加问句用willyou。,单元语法聚焦三,Dontdothatagain,willyou?Gowithme,willyou/wontyou?Letsgo,shallwe?Letustakeanexam,willyou?(2)祈使句用于两个重要句型“祈使句and表结果的陈述句”用来叙述肯定的条件。“祈使句or表结果的陈述句”用来叙述否定的条件。,单元语法聚焦三,注意这两个句型都可以改写为if引导的条件状语从句。Workhard,andyouwillpasstheexam.(Ifyouworkhard,youwillpasstheexam.)Workhard,oryouwillnotpasstheexam.(Ifyoudontworkhard,youwillnotpasstheexam.),单元语法聚焦三,实战演练,.单项选择()1.2017白银Boysandgirls，_learningandhavefun.AkeepBtokeepCkeepingDkept,A,单元语法聚焦三,()2._carefully,please!Lookattheroadsign.Thereisaschoolahead.ADriveBTodriveCDrivingDDrives,单元语法聚焦三,A,()3._patientwithhim,please.Heisonlythreeyearsold.ADontBBeCIsDDoes,单元语法聚焦三,B,()4.2017渝北_throwingthosestones,please.AStopBStopsCStoppingDStopped,单元语法聚焦三,A,()5.2017安徽Holdyourdream，_youmightregretsomeday.AandBorCbutDso,单元语法聚焦三,B,()6.2017滨州IwanttobeateacherwhenIgrowup.Workhard，_yourdreamwillcometrue.AorBbutCthoughDand,单元语法聚焦三,D,.按要求完成下列各题1.2017达州Thiswarningsigntellsusnottopickflowers.(保持句意基本不变)Thiswarningsignsays“_flowers”2.2016天水Tellhimthetruthatonce,orhewillbeangry.(改为主从复合句)_donttellhimthetruthatonce,hewillbeangry.,pick/Nopicking,单元语法聚焦三,Dont,If,you,3.2017天水Letusgohiking,_？(完成反意疑问句)4.Y