英语专业四级语法专题(情态动词)

英语专业四级语法专题,情态动词,I.“neednt完成时态”结构didntneed+不定式一般式：动作还未发生neednt不定式完成式：动作已经发生You_Jimanythingaboutit.Itwasnoneofhisbusiness.A.neednthavetoldB.neednttellC.mustnthavetoldD.mustnttell,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/should,对将来对现在对过去,情态动词,may,might,cant,couldnt,can,could,+V+V+havedone/常见mustbemustbedoinghavebeendoing,+V.+V.+havedone+bedoing/havebeendoing可以用not表示“可能不”,+V.+V.+havedone+bedoing/havebeendoing,+V.+V.+havedone+bedoing,II.“can/could+不定式完成式”表示对过去发生事情的推测（可用于肯定句、否定句、一般疑问句）；表示过去某种动作可能发生，但是由于某种原因而没有做到的事情。Wecould_himwithadetachedhousewhenhecame,buthehadspecificallyaskedforasmallflat.A.provideB.haveprovidedC.notprovideD.nothaveprovided,III.“may/might/must+不定式完成式”表示对过去事物的怀疑和推测（可用于肯定句）She_fiftyorsowhenIfirstmetherataconference.A.hadbeenB.mustbeC.hasbeenD.musthavebeen,在反意疑问句中，当附属部分含有表示推测意义的must时，疑问部分的助动词应与must后面的动词在非推测情况下的用法保持一致。Hemustbeaworker,_he?YoumusthavelearnedEnglishformanyyears,_you?Itmusthaverainedlastnight,_it?Hemusthavearrivedbyyesterdaymorning,_?,isnt,havent,didnt,hadnthe,IV.“mustnt+动词不定式一般式”表示“不允许”，是说话人强有力的劝告或命令MustIhanditnextweek?No,you_?A.mustntB.cantC.wontD.neednt,V.couldV.S.was/wereabletowas/wereableto表示过去有能力并且成功地做了某事;could表示过去一般的能力，但不表示做或未做某事.Thefirespreadthroughthehotelquicklybuteveryone_getout.A.hadtoB.wouldC.couldD.wasableto,VI.could/might/would表委婉MightIwatchTVaftersuper?Yes,you_.A.mayB.couldC.wouldD.mightCould/MightIuseyourbiketomorrowmorning?-Yes,youcan/may.(否定:No,Imafraidnot),ThesentencethatexpressesOFFERisA.Illgetsomedrink.Whatllyouhave?B.Doessheneedtobookaticketnow?C.MayIknowyouname?D.Canyoureturnthebooknextweek?,Will表意愿：在疑问句中表示请求和建议.,祈使句+反意疑问句Whenyouhavefinishedwiththebook,dontforgettoreturnittoTim,_?A.doyouB.willyouC.dontyouD.wontyou,VIII.可兼做行为动词的情态动词：need、dare,情态动词(+动词原形),行为动词,.,need,dare,1.无人称和数的变化;,2.尤其用于：,*否定句及疑问句中;,*在if/whether之后;,*或与hardly,never,noone,nobody连用;,3.常以need