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1、hadbetter,should,oughtto学习四要素hadbetter,should,oughtto均为提建议型情态动词，常用来劝告别人去做某事，没有人称和数的变化，学习时应注意下列几点：一.掌握基本用法hadbetter,should,oughtto含义及语气有所不同，请看下表：二.掌握创新用法should可表竟然，强调惊讶的情绪。Ican'timaginethisproblemshouldbesoeasy.我想像不出这个问题竟然这么容易。hadbetter也可改为hadbest，其意义和用法不变。I'mbusynow,soyouhadbestgo
2、therealone.我现在很忙，所以你最好单独去那儿。三.掌握句型变换方法hadbetter,should,oughtto均属于助动词，其疑问句、否定句及反意疑问句的构成均在自身形式上做变化。1.变成否定句方法hadbetterdo否定式为hadbetternotdo,shoulddo否定式为shouldnotdo或shouldn'tdo,oughttodo否定式为oughtnottodo或oughtn'ttodo。2.变成一般疑问句方法hadbetter,should,oughtto构成一般疑问句时应分别将had,should,ought提到句首，其肯
3、定与否定回答为had/hadn't,should/shouldn't,ought/oughtn't。3.变成反意疑问句方法hadbetter,should,oughtto构成反意疑问句时通常使用had/hadn't,should/shouldn't,ought/oughtn't形式。Shehadbetterwatertheflowersassoonaspossible,hadn'tshe?她最好尽快给花浇水，不是吗？Allofusshouldtakeanactivepartinthisactivity,shouldn'twe?我们都应该积极参加这次活动，不
4、是吗？Theyoughtn'ttogofishinginthisriver,ought/shouldthey?他们不该在这条河里钓鱼，是吗？四.掌握完成式用法should与oughtto完成式意义和用法相同，可以通用。should/oughttohavedonesth.本来应该做某事但实际未做，表达一种遗憾的感情色彩。shouldn't/oughtn'ttohavedonesth.本来不应该做某事但实际已做了，也表达一种遗憾的感情色彩。hadbetter没有完成式。Themeetinghasalreadybegun.Youshouldhavecomeher
5、ehalfanhourago.会议已经开始了，你本来应该半小时之前就到这儿。Sheisverysadnow.Yououghtn'ttohavetoldherthenews.她现在很难过，你本不该把这消息告诉她。［巩固练习］I.从A、B、C、D中选出可以填入空白处的最佳答案。1.ThisdictionarybelongstoRita.You____________ithomewithoutlettingherknow.A.hadbetternottotakeB.shouldn'thavetakenC.oughtn'ttakeD.shouldn'tbetaki
6、ng2.Ourmoneyisverylimited,soyou___________somuchmoneyonsodearaskirt.A.shouldn'thavespentB.shouldn'tbespendingC.needn'thavespentD.oughtn'tspend3.You__________toyourfatherlikethis,afterallheisyourfather.A.needn'thavespokenB.mustn'thavespokenC.oughtn'ttohavespokenD.oughttonothavespok
7、en4.Ireallycan'tunderstandsuchabeautifulgirllikeher_________besorude.A.mustB.wouldC.shouldD.might5.Look,thebooksonthedeskareallwet.You__________allthewindowstokeeptherainout.A.musthaveshutB.shouldhaveshutC.oughthaveshutD.canhaveshut6.Thelittlegirlhadbetternotstayuptoolate,________
8、___she?A.doesB.willC.hadD.has7.Th
