牛津英语语法 情态动词.ppt

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1、Youshouldn'teatmeat.So,theyhavetobegivendrugs.Youdidnothavetoeatthat!Yououghttoeatsomesaladinstead.Weshoulduselandtogrowfoodforpeopleinsteadofcattle.Modalverb(情态动词）Weusewordshaveto,must,shouldandoughttotoshowthatitisnecessaryorimportanttodosomething.Modalverb(情态动词）Youshouldn'teatmeat

2、.So,theyhavetobegivendrugs.Youdidnothavetoeatthat!Weshoulduselandtogrowfoodforpeopleinsteadofcattle.Yououghttoeatsomesaladinstead.Whatformdoweusewhenaverbaftermodalverbs?Weshouldusethebaseform(i.e.,theformusedinthedictionary)ofaverbaftermodalverbsModalverb(情态动词）e.g.Imustleavenow.Ihav

3、etoleavenow.我自己想离开，主观愿望也许我还想坐一会儿，但我还有要事，不得不走了Negativemustnot=somethingisnotalloweddonothaveto=somethingthatisnotnecessaryMusthasnopastform,soweusehadtoinsteadCanyoufindanexampleinthetext?Theanimalsyoueathadtospendtheirlivescrowdedtogetherintinyspaces.Modalverb(情态动词）Weuseshouldandough

4、ttowhenwefeelthatitisimportanttodosomething,ortogiveadvice.Should---强调个人主观看法Oughtto---强调客观因素所以在表示建议的时候，should的语气更强Modalverb(情态动词）Oughttoisnotcommonlyusedinaquestionorinanegative.Modalverb(情态动词）比较must,haveto,和should/oughtto所表示的不同意义Fillingtheblankwithmust,havetoorshould/oughtto1）钢琴老师对某

5、学生说You___practiseatleastanhouraday.2)这个学生然后对他的朋友说I____practiseanhouraday!3)他的朋友会说You_______practiseformorethananhour.musthavetooughtto/shouldS1:I'vegotspotsonmyface.S2:ThenyouhavetotakemoreVitaminA.S1:WherecanIgetit?S2:Fromgreenvegetables.JumpingDivingsmokingFightingSwimingShoweringI

6、fyouarealifeguardataswimmingpool.Whatwillyousaytothesepeople?Usemustormustnot.You______getupsoearly.You_____havebreakfasteverymorning.You_____eatfruitandvegetables.You______drinkbeeratlunch.You_____takealongnapaftereatingsomuch.You____eatdinnerearlier.You_____gotobedearlier.Useshould

7、,shouldnotandoughtto