Period4GrammarModalVerbsPeriod4GrammarModalVerbsThefirstwealthishealth.健康是人生第一财富。Alightheartliveslong.豁达者长寿。Earlytobedandearlytorisemakesamanhealthy,wealthyandwise.早睡早起会使人健康、富有和聪明。Withouthealthnopleasurecanbetastedbyman.没有健康就没有乐趣。Goodhealthisoverwealth.健康是最大的财富。Whatshould/shouldn’twedotokeephealthy?Ifyou’dliketogiveadviceoropinions,youcanuse•should/oughtto/hadbetterdoWhatoughtwetodotokeephealthy?Goodhabitscanhelpustokeephealthyandbadonescancausediseases.ThereisaseriousdiseasecalledH1N1fluthesedays.Itspreadseasilyamongpeopleinspringandautumn.Thefluisaseriousdisease,butwedon’thavetobeafraidofit.Wecandosomethingtopreventit.Buthow?•Weoughttokeeptheairfreshallthetime.•Weoughttokeepawayfromcrowdedplaces.•We’dbetterdrinkmorewatereveryday.Youshouldgotoschoolrightaway.It’seighto’clocknow.Heshouldbeatwork.Itseemssounfairthisshouldhappentome.Youshouldhaveremindedmeofthemeeting.Whatshouldwedonow?表惊讶：竟然用于第一人称疑问句，询问对方的意愿表责备，谴责Whatkindoffoodmustweeattobestrong?must/havetoMustIfinishthetaskrightnow?Yes,youmust/youhaveto.No,youneedn’t/youdon’thaveto.ShecalledmeyesterdayeveningbutIdidn’thearit.I_________________(be)asleep.musthavebeen1.--Willyoustayforlunch?--Sorry,_____.Mybrotheriscomingtoseeme.A.Imustn’tB.Ican’tC.Ineedn’tD.Iwon’t2.--MayIpickaflowerinthegarden?--________.A.No,youneedn’tB.Not,please.C.No,youmustn’tD.No,youwon’t.3.You______returnthebooknow.Youcankeepittillnextweekifyoulike.A.can’tB.mustn’tC.needn’tD.maynot4.John,you__playwiththeknife,you__hurtyourself.A.won’t;can’tB.mustn’t;mayC.shouldn’t;mustD.can’t;shouldn’tCBBCmustn’tneedn’tshouldn’tcan’t表示否定的情态动词的用法:不准,禁止没必要(=don’thaveto)不应该(=oughtnotto)不能，不可能Couldyouusethemtomakesentences?Whatmodalverbshaveyoulearned?•can/could•may/might•will/would•shall/shouldhadbetter•musthavetoneed•oughtto•dare*can/could只能表示现在或过去的能力*beableto能用于各种时态相当于managetodosth./succeedindoingsth.1.表示“能力”的情态动词的用法can,could（beableto）1.He___________gotothepartyyesterdayeveninginspiteoftheheavyrain.2.Althoughhe_____swim,he__________crosstheriver.wasabletocan’twasabletomay/might,can/could2.表示“许可”的情态动词1.---____Igoouttoplay,mum?---No,you___.Youshoulddoyourhomeworkfirst.A.Might;wouldn’tB.Can;needn’tC.Can;can’tD.Need;mustn’t2.---CouldIcallyoubyyourfirstname?•---Yes,you____.•A.willB.couldC.canD.might3.表示“请求”的情态动词的用法will/would,shall/should*均可表示将来。过去时为should,would.*will,would可表示意愿、常出现的动作。在疑问句中表示请求和建议.must,could,may,might,can’t4.表示“推测，可能性”的情态动词can表示推测时，只能用在否定句或疑问句中。It’ssolate.CanTombereading?这么晚了，汤姆还在看书吗？这个人不可能是玛丽，她生病了。Itcouldn’tbeMary.Shehadfallenill.情态动词能表示时态吗？1.表示对现在的推测2.表示对过去的推测3.表示对将来的推测表示推测——情态动词的重要用法肯定的推测可能的推测否定的推测疑问的推测must对将来对现在对过去情态动词may,mightcan’t,couldn’tcan,could+V.+V.+havedone常见mustbe+bedoing+V.+V.+havedone+bedoing可以用not表示“可能不”+V.+V.+havedone+bedoing+V.+V.+havedone+bedoingYoulooktired.You_______gotobednow.shouldYou_______________believeeverythingyoureadontheInternet.shouldn’t/can’tMymothercookedalotoffoodforme.Shehasbeencookingallthemorning...
