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时间:2020-03-04
《高中英语语法情态动词复习课件.ppt》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、情态动词一、情态动词的基本用法:1.can/could表示能力;Eg.Hecanspeakthreelanguages.Shecouldswimattheageof5.表示客观的可能性;Eg.Accidentscanhappentoanydrunkendriver.Swimminginthelakecanbedangerous.表示请求和允许;Eg.CanIhavealoolkatyournewwatch?Yes,ofcourseyoucan.表示请求时,口语中常用could代替can使语气婉转,但回答时仍用ca
2、n;Eg.CouldyoupleasehelpmelearnEnglsih?Yes,Ican.表示惊讶、怀疑、不相信的态度(主要用于否定句、疑问句);Eg.Howcanyoubelievesuchaliarashim?Thatcan’tbetrue.2.may/might表示允许、许可;(否定回答用mustn’t,表示“禁止”)Eg.MayIlistentomusicwhiledoingmyhomework?No,youmustn’t.表示请求许可时,might比may的语气更委婉些;Eg.May/MightIt
3、roubleyoutopassmethebook?表示可能性的推测,might比may的语气显得更加不肯定;Eg.Tommaygotothecinemawithusthisevening.Tommightgotothecinemawithusthisevening.may用于祈使句表示祝愿;Eg.Mayyouhaveahappylife.Mayyousucceed.3.will/would表示意志或意愿;(will表示现在,would表示过去)Eg.Iwilltellyouaboutit.Hetoldmethat
4、hewouldhelpme.用于第二人称时表示请求、建议等,用would比will委婉、客气;Eg.Willyougetmeadictionary?Wouldyoucomethisway,please?表示习惯性的动作,意为“惯于”;(will表示现在,would表示过去)Eg.Thatoldwomanisstrange.Shewilllsitforhourswithoutsayinganything.Whenhewasyoung.Hewouldpractiseplayingthepianoforhoursada
5、y.表示预料或猜想;Eg.Itwillbetenwhenwegetthere.表示规律性的“注定会”用will;Eg.Peoplewilldiewithoutwater.Shewillbetwelvenextyear.4.need表示“需要、必要”,作情态动词,仅用于否定句和疑问句。Eg.NeedItellhimeverything?Yes,youmust./No,youneedn’t.用作实义动词时,其变化与一般动词相同:Eg.IneedtogotoNanjingtoattendameetingthisweek
6、end.5.dare表示“敢、敢于”;作情态动词,主要用于疑问句、否定句和条件句中。Eg.Darehetellthemwhatheknows?Theydarenotgooutaloneatnight.用于实义动词,在否定句中可接带to或不带to的不定式。Eg.Hedaresnot(to)tellthemanagerthetruth.6.oughtto表示“应该”同should;Eg.Humanoughttostoppollutingthenature.Yououghtnottogetinvolvedinthema
7、tter.表示推测,意为“想必”;Eg.TheyoughttogettoBeijingbynow.7.must表示“必须、应该”语气比should,oughtto强烈,否定形式mustn’t表示“不准、不应该、禁止”等;Eg.Driversmustn’tdriveafterdrinking.Youmustbecarefulwhencrossingthestreet.在回答带有must的问句时,否定回答常用needn’t或don’thaveto,表示“不必”而不用“mustn’t”;Eg.MustIfinishmy
8、homeworkbeforeeight?No,youneedn’t./No,youdon’thaveto.表示很有把握的推测,意为“一定、准时”,用于肯定句;Eg.Youmustbeill.Icanseeitfromyourface.Theymustbeplayingbasketballnow.表示偏执、固执;Eg.Whymustyoualwaysinterruptme?
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