高一英语（下）必修三Unit 2 情态动词 (II)

GrammarModalverbs情态动词

(II)Unit2Healthyeating1.作为情态动词用，常用在否定句和疑问句中。Dare(need)+S+VS+daren’t(needn’t)+VIdaren’twalkthroughtheforestatnight.Dareyouwalkthroughtheforestatnight?Youneedn’treturnthebooknow.Needhegoyesterday?可兼做行为动词的情态动词：need、dare

2.作实义动词用，常用在肯定句中,有人称、时态、和数的变化Heneedstogotherehimself.Hehasgrownup,wedon’tneedtoworryabouthim.3.Sth(sb)need(want,request)+doing/tobedoneThehouseneedscleaning/tobecleanedTheboyneedssendingtothehospitalatonce.OurcolorTVsetisstillgoodenough.Youneedn’thaveboughtanewone.4.needn’thavedone表示原本不必要做的事情却已经做了的情况,意为“本不必要…”Yourhomeisnotfarfromyourschool,soyouneedn’thaveleftinsuchahurrythen.5.注意对need问句的回答:--NeedIfinishtheworktoday?--Yes,________________.No,________________.No,________________.youmustyouneedn’tyoudon’thaveto--Mustwedoitnow?--No,you__________.needn’t(don’thaveto)情态动词的其他用法maywell+v=havegoodreasonto(理所当然）

Youmaywellsayso.may/mightaswell=hadbetterdo.(最好。。）

Youmayaswellsayso.mayaswell+v….+as+v(与其….不如….)(最好….而不要….）Youmightaswellthrowyourmoneyawayaslendittohim.1.may1.Judgingfromhisaccident,hemustbefromthesouth,2.Itiseleveno’clockatnightandthelightsareoff.Theymustbesleepingnow,isn’the?

aren’tthey?因must后是系动词be

must后接的是besleeping，是对正在进行的情况推测2.与must有关句子的反意疑问句1.Wemusthavelearned2,000wordsbytheendoflastterm,hadn’twe?3.HemusthavegonetoBeijing,didn’tit?hasn’the?

若句中含有过去完成时的时间状语，用过去完成时完成反意疑问句若句中含有过去的时间状语，用一般过去时完成反意疑问句若句中不含任何时间状语，用现在完成时完成反意疑问句2.Itmusthaverainedlastnight,fortheroadwasverymuddy，.cannotbut+dosth表示“不得不，只好”。Icannotbutadmireyourbravery.我不得不钦佩你的勇气。Icouldnotbutchoosetogo.我只好去。3.can1.判断正误:Howdareyousaysuchathing?Howdareyoutosaysuchathing?Hedaren’ttospeakEnglishbeforesuchacrowd,didhe?Hedaren’tspeakEnglishbeforesuchacrowd,darehe?ExercisesNobodyneedtobeafraidofcatchingthedisease.Nobodyneedbeafraidofcatchingthedisease.Thesedishesneedbecleanedcarefully.Thesedishesneedtobecleanedcarefully.Thesedishesneedcleaningcarefully.1.Therewasalotoffunatyesterday’sparty.You____come,butwhydidn’tyou?A.musthaveB.shouldC.needhaveD.oughttohaveD2.Iwonderhowhe____thattotheteacher.A.daretosayB.daresaying

C.notdaresayD.daredsayD3.Chinesemusthavethelargestnumberofspeakers,____.A.mustn’ttheyB.haven’ttheyC.don’ttheyD.didn’ttheyC4.Asitturnedouttobeasmallhous