情态动词讲解_英语_初中教育_教育专区

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1、1・表示能力时，只能用can（现在）coulddo（过去能做）was/wereabletodo:（1）过去能做（2）过去设法成功完成某一具体动作二managetodo二succeedindoingEg.1.Ablindmemcemnotjudgecolors.2.Hecould/wasabletoswimlikeafishwhenhewasyoung.3.Thoughhewastired,hewbsnbletoswimacrosstheriver.4.Becausehewastired,hecouldn‘t/wasn‘tabletoswimacros

2、stheriver.（在否定结构中无区别）2•表推测时：may/might（语气最不肯定，多用于肯，否定句）可能can（语气肯定，一般不用丁•肯定句）可能could（较can不确定，也可用于肯定句）可能must（语气最肯定，只用肯定句）一定should（表可能性，推论，推测，期待等）按理该；估计oughtto（表可能性，揣测，猜测，期望等）照说应该，理应may/mighthave+ed（语气不肯定）过去可能can't/couldn'thave+ed（语气肯定）过去不可能musthave+ed（语气肯定）过去一定shouldhave+ed过去按理应该o

3、ughttohave+ed过去按理Eg.l.A:Look,someoneiscoming.Whocanitbe?B:Itmaybetheheadmaster.A:Itcannotbehim.HehasgonetoShanghai.B:ItmustbeMrZhang.Helooksliketheheadmaste匚2.1doiftknowhisage.Hecouldbethirtyorthirty-five.3.Thereportiswrittenaftercarefulinvestigation,soitshouldbereliable.4.■一Id

4、idn5tseeMaryatthemeetingyesterday.—Shemighthavebeenill,Iguess.5.Thestreetarealldry.Itcouldrfthaverainedduringthenight.3・表责备时：may/mighthave+ed（语气委婉）过去本可能…can/couldhave+ed（语气委婉）过去本能shouldhave+ed（语气强烈）过去本应该，而未oughttohave+ed（语气强烈）过去木应该，而未needn，thave+ed过去木不必…，却做了…Eg.l.Hemighthavegiv

5、enyoumorehelp,eventhoughhewasverybusy.2.-一Didyoulistentothespeech?——No,wecouldhaveattendedit.Butwehadalotoftrafficonourway.3.Theplantisdead・MaybeIshouldhavegivenmorewater.4.Yourbrother^failedinEnglishagain.Yououghttohavegivenhimmorehelp.2.一-MrSmithdidn'tcomelastnight,didhe?——No

6、.Weneedn'thavewaitedforhim.Awholenightwaswasted.4•表未曾实现：was/weretohave+ed过去本打算/本想shouldlike/lovetohave+ed过去本想而没=wouldlike/lovetohave+ed=shouldhaveliked/lovedtodo=wouldhaveliked/lovedtodohadbetterhave+ed当初最好wouldratherhave+ed当初真该Eg.1•Hewastohavecomehereyesterday,buthehadanimport

7、antmeetingtoattend.2.Wewouldliketohavegonetoseethefilm,butwehadnotime.3.Iwouldlovetohavegonetothecinematoseethefilmthatday,buttheticketswereallsoldout.4.1shouldhavelikedtostayanotherweek,butIhadtogobacktowork.2.Wehadbetterhavebought（当时真该买）thebook.6.Shewouldratherhavestayed（当初真该

8、呆）athomethangotoseethedullfilm.肯定的答语canmaywill5.委婉的请求c