年高考英语复习情态动词省公开课一等奖全国示范课微课金奖PPT课件.pptx

情态动词(一）情态动词有一定意义，但没有些人称和数改变，不能独立使用，它和后面动词组成谓语．

只作情态动词can/could,may/might, oughtto，must
可情态可实义need,dare/dared
可情态可助动词shall/should,will/would
相当于情态动词haveto,usedto
Must,can/could,may/might使用方法2.Must+bedoing/do表示对现在动作进行必定推测3.Must+havedone表示对过去发生事情作出必定判断can,could和beableto使用方法Althoughthesoldierwasbadlywounded,hewasabletotellwhathadhappened.can/could在疑问句中Could比can更有礼貌，在此不是can过去式。

Canyouwaitamomentplease?
Liz,canyoudomeafavor?
Excuseme,couldyoutellmethewayto
thestation?
Iwonderifyoucouldhelpme.(请求)2.can/couldhavedone对过去发生行为可能性进行推测:3.can/couldhavedone“本能够，原来可能已经”用于必定句中，表示对过去发生事情做出判断，他们可能还在等我们呢。3.might/mayhavedone,表示对过去发生动作进行可能性推测，4）May表示许可，表示允许他人做某事，也可征求对方许可。
MayIopenthedoor?
Wemaykeepthebookfortwoweeks.
5）用于祈使句，表示祝福。
Mayyousucceed!
Mayyouhaveanicetrip!Will/Wouldyoudo…?(表请求would更委婉)
表意志，愿望，决心
would表过去重复发生得动作或某种倾向
“总是,总要”
usedto表过去经常（现在已没有这种习惯）
“过去经常”
usedto可于状态动词连用would不能够
eg.Heusedtobeaquietboy.()
Hewouldbeaquietboy.()
Shall/shoulda.should用于表示合理推断。
Itisthreeo’clock,thefootballgameshouldbeginnow.
Marytookdancinglessonsforyears,sheshouldbeanexcellentdancer.

Youngpeopleshouldlearnhowtousecomputers.Everycitizenoughttoobeylaw.Yououghtnottogo.Youshould/oughttohavetoldherthetruthearlier.
Sheshouldn’thaveleftwithoutsayingaword.must和havetoIdon’tlikethisTVset.Wemustbuyanewone.Therewasnomorebus.Theyhadtowalkhome.need/dare
a.need表需要和必须惯用于否定句和疑问句,needn’thavedone“本无须做…”
b.dare表敢,惯用于否定句,疑问句和条件句中。
c.dare与need用做实意动词时有时态，人称和数改变,但dare用于否定句和疑问句时常接不带to不定式,need后要接带to不定式。
Completethefollowingsentenceswithpropermodalverbs.
1)You’vebeenworkingallday.You______beverytired.
2)(Thedoorbellrings)Iwonderwhothatis,it________beLisa.She’sstillinthelibraryatthistime.
3)Itisalongtimesincewemetlasttime.You________comeandseeusmoreoften.
4)Ihaven’tdecidedwhereI’mgoingformyholidays.I______gotoAustralia.
5)Myfather’sbirthdayiscoming.What________Igethim?
6)Whydon’tyoutryonthisdress?It__________lookniceonyou.
7)“Whowasthemantalkingwithyourteacher?”“I’mnotsure.It___________beherbrother.
8)Idon’tknowwhentheguests