2025-2026年江苏省苏教版初中英语八年级下册第8单元语法练习题

2025-2026年江苏省苏教版初中英语八年级下册第8单元语法练习题一、单项选择题（总共10题，每题2分，共20分）1.The8thunitofthe2025-2026JiangsueditionoftheSujiaoEnglishtextbookforGrade8focusesonthegrammaticalstructureofmodalverbs.Whichsentencecorrectlyuses"must"toexpressnecessity?A.Youcangotothelibraryafterfinishingyourhomework.B.Youmusttofinishyourhomeworkbeforegoingtothelibrary.C.Youhavetofinishyourhomeworktogotothelibrary.D.Youmustn’tfinishyourhomeworkifyouwanttogotothelibrary.Answer:CExplanation:OptionCiscorrectbecause"must"isuseddirectlytoexpressobligationwithoutrequiringanauxiliaryverblike"to."OptionAuses"can"toindicateability,notnecessity.OptionBincorrectlyadds"to"after"must,"whichisgrammaticallyincorrect.OptionDuses"mustn’t"toexpressprohibition,notnecessity.2.Inthe8thunit,studentslearntodifferentiatebetween"might"and"may".Whichsentenceappropriatelyuses"might"tosuggestapossiblefutureevent?A.Itmayraintomorrow,sobringanumbrella.B.Shemightpasstheexamifshestudieshard.C.Hemayforgetyourbirthdaynextweek.D.Theymightnotattendthepartybecausetheyaretired.Answer:BExplanation:OptionBiscorrectbecause"might"isusedtoexpressalowerlikelihoodoruncertaintyaboutafuturepossibility,whichalignswiththeunit’sfocusonmodalverbs.OptionAuses"may"toindicateapossiblefutureeventwithhighercertainty.OptionCalsouses"may"tosuggestapossiblebutlesslikelyoutcome.OptionDuses"mightnot"toexpressanegativepossibility,butthecontextismoreaboutcertaintythanpossibility.3.The8thunitintroducesthestructure"must+have+pastparticiple"todescribealogicalconclusionaboutapastevent.Whichsentencecorrectlyusesthisstructure?A.Shemustwenttothestorebecauseherbagisempty.B.Hemusthavelosthiskeys;theyarenotonthetable.C.Theymusthaveeatendinneralready;theirstomachsarefull.D.Imusthaveforgottenyourphonenumber;Ican’trememberitnow.Answer:CExplanation:OptionCiscorrectbecauseitfollowsthestructure"musthave+pastparticiple"toinferapastactionbasedonpresentevidence(fullstomach).OptionAisgrammaticallyincorrectbecause"must"doesnotrequireanauxiliaryverblike"have."OptionBuses"musthave"butthecontextismoreaboutassumptionratherthanlogicalconclusion.OptionDuses"musthave"toexpressregret,whichisnottheprimaryfocusofthisunit’sgrammarpoint.4.The8thunitemphasizestheuseof"should"togiveadvice.Whichsentenceprovidesappropriateadviceusing"should"?A.Youshouldtostudyeverydaytoimproveyourgrades.B.Heshouldnotgotothepartyifheissick.C.Sheshouldhavefinishedherhomeworklastnight.D.Youshouldhaveboughtagiftforyourfriend.Answer:BExplanation:OptionBiscorrectbecause"should"isusedtoofferadviceorrecommendations,and"not"iscorrectlyplacedtoexpressprohibition.OptionAisincorrectbecause"should"doesnotrequire"to"afterit.OptionCuses"shouldhave"todescribeapastaction,whichisnotthefocusofadvice.OptionDalsouses"shouldhave"toexpressapastobligation,notcurrentadvice.5.Inthe8thunit,studentspracticeusing"can’t+have+pastparticiple"toexpresscertaintyaboutapastevent.Whichsentencecorrectlyusesthisstructure?A.Shecan’thaveseenyouattheschoolyesterday.B.Hecan’thavegonetothestorebecauseheisherenow.C.Theycan’thavefinishedtheproject;itisstillincomplete.D.Ican’thaveeatentoomuchbecauseIfeelfine.Answer:BExplanation:OptionBiscorrectbecauseituses"can’thave+pastparticiple"toexpresscertaintyaboutapastactionbasedonpresentevidence(heishere).OptionAuses"can’thave"butthecontextismoreaboutpossibilityratherthancertainty.OptionCuses"can’thave"toexpressdoubt,whichisnottheprimaryfocusofthisunit’sgrammarpoint.OptionDuses"can’thave"toexpressanegativepossibility,butthecontextismoreaboutuncertaintythancertainty.6.The8thunitintroducesthestructure"could+have+pastparticiple"todescribeapastpossibilitythatdidnothappen.Whichsentencecorrectlyusesthisstructure?A.Shecouldhavepassedtheexamifshehadstudiedharder.B.Hecouldhavegonetotheparty,buthedecidedtostayhome.C.Theycouldhavefinishedtheprojectearlier,buttheywerebusy.D.Icouldhaveeatenmore,butIwasfull.Answer:BExplanation:OptionBiscorrectbecauseituses"couldhave+pastparticiple"todescribeapastpossibilitythatwasactualizedbutdidnothappen.OptionAuses"couldhave"toexpressahypotheticalpastsituation,whichisnotthefocusofthisunit’sgrammarpoint.OptionCalsouses"couldhave"todescribeapastpossibility,butthecontextismoreaboutexplanationratherthanpossibility.OptionDuses"couldhave"toexpressapastdesire,whichisnottheprimaryfocusofthisunit’sgrammarpoint.7.The8thunitteachestheuseof"needn’t+have+pastparticiple"todescribeapastactionthatwasunnecessary.Whichsentencecorrectlyusesthisstructure?A.Youneedn’thaveboughtanumbrellabecauseitdidn’train.B.Heneedn’thavegonetothestorebecausethefoodwasalreadythere.C.Sheneedn’thavefinishedherhomeworkbecauseitwasoptional.D.Ineedn’thavecalledyoubecauseyouansweredmymessage.Answer:BExplanation:OptionBiscorrectbecauseituses"needn’thave+pastparticiple"toindicateapastactionthatwasunnecessarybasedonlaterinformation.OptionAisincorrectbecause"needn’thave"isusedtoexpressunnecessaryaction,nottodescribeapasteventthatdidn’thappen.OptionCuses"needn’thave"toexpressapastdecision,butthecontextismoreaboutobligationratherthanunnecessaryaction.OptionDalsouses"needn’thave"toexpressapastdecision,butthecontextismoreaboutnecessityratherthanunnecessaryaction.8.The8thunitintroducesthestructure"shouldhave+pastparticiple"toexpressregretaboutapastaction.Whichsentencecorrectlyusesthisstructure?A.Youshouldhavestudiedharderforthetest.B.Heshouldhavegonetotheparty,buthewastootired.C.Sheshouldhavefinishedherhomeworkearlier.D.Ishouldhavecalledyouyesterday,butIforgot.Answer:AExplanation:OptionAiscorrectbecauseituses"shouldhave+pastparticiple"toexpressregretaboutapastinaction.OptionBuses"shouldhave"todescribeapastpossibility,whichisnotthefocusofthisunit’sgrammarpoint.OptionCalsouses"shouldhave"toexpressregret,butthecontextismoreaboutadviceratherthanregret.OptionDuses"shouldhave"toexpressapastobligation,butthecontextismoreaboutforgetfulnessratherthanregret.9.The8thunitemphasizestheuseof"may+have+pastparticiple"todescribeapasteventaboutwhichthespeakerisnotcertain.Whichsentencecorrectlyusesthisstructure?A.Shemayhavelostherkeysbecausetheyaremissing.B.Hemayhavegonetothestore,butI’mnotsure.C.Theymayhavefinishedtheproject,butIhaven’theardyet.D.Imayhaveeatentoomuch,butI’mnotsure.Answer:BExplanation:OptionBiscorrectbecauseituses"mayhave+pastparticiple"toexpressuncertaintyaboutapastaction.OptionAuses"mayhave"tosuggestalogicalconclusion,whichisnotthefocusofthisunit’sgrammarpoint.OptionCalsouses"mayhave"toexpressuncertainty,butthecontextismoreaboutinformationratherthanpossibility.OptionDuses"mayhave"toexpressapastpossibility,butthecontextismoreaboutpersonalfeelingratherthanuncertainty.10.The8thunitintroducesthestructure"might+have+pastparticiple"todescribeapasteventaboutwhichthespeakerisevenlesscertain.Whichsentencecorrectlyusesthisstructure?A.Shemighthaveseenyouattheschoolyesterday.B.Hemighthavegonetothestore,butI’mnotsure.C.Theymighthavefinishedtheproject,butit’snotconfirmed.D.Imighthaveeatentoomuch,butI’mnotreallysure.Answer:DExplanation:OptionDiscorrectbecauseituses"mighthave+pastparticiple"toexpressaverylowlevelofcertaintyaboutapastaction.OptionAuses"mighthave"tosuggestapossibility,whichisnotthefocusofthisunit’sgrammarpoint.OptionBalsouses"mighthave"toexpressuncertainty,butthecontextismoreaboutpossibilityratherthanlowcertainty.OptionCuses"mighthave"todescribeapastpossibility,butthecontextismoreaboutconfirmationratherthanlowcertainty.二、填空题（总共10题，每题2分，共20分）1.Accordingtothe8thunitoftheSujiaoEnglishtextbook,ifyouaresurethatyourfriendforgotyourbirthday,youcansay,“He_______forgottenmybirthdaybecausehisapartmentwasempty.”Answer:musthaveExplanation:Thesentencerequiresthestructure"musthave+pastparticiple"toexpressalogicalconclusionaboutapastaction."Musthaveforgotten"indicatescertaintybasedonevidence(emptyapartment).2.Inthe8thunit,studentslearnthat"should"isusedtogiveadvice.Ifyourbrotherisalwayslate,youcanadvisehim,“You_______getupearliertoavoidbeinglateforschool.”Answer:shouldExplanation:Thesentencerequires"should"toofferadviceaboutaregularaction(gettingupearlier)."Shouldgetup"isthecorrectformtoexpressrecommendation.3.The8thunitintroduces"can’t+have+pastparticiple"toexpresscertaintyaboutapastevent.Ifyouknowyoursisterdidnotattendtheparty,youcansay,“She_______gonetothepartybecauseshecalledmefromthehospital.”Answer:can’thaveExplanation:Thesentencerequires"can’thave+pastparticiple"toexpresscertaintyaboutapastactionthatdidnothappen."Can’thavegone"indicatescertaintybasedonevidence(hospitalcall).4.Inthe8thunit,studentspracticeusing"might+have+pastparticiple"todescribeapastpossibility.Ifyouarenotsurewhetheryourfriendpassedtheexam,youcansay,“She_______passedtheexambecauseshewasverynervous.”Answer:mighthaveExplanation:Thesentencerequires"mighthave+pastparticiple"toexpressapastpossibilitywithlowcertainty."Mighthavepassed"suggestsapossibilitybasedonthecontext(nervousness).5.The8thunitteachestheuseof"needn’t+have+pastparticiple"todescribeapastactionthatwasunnecessary.Ifyouboughtanumbrellabutitdidn’train,youcansay,“I_______boughtanumbrellabecauseitdidn’train.”Answer:needn’thaveExplanation:Thesentencerequires"needn’thave+pastparticiple"toexpressanunnecessarypastaction."Needn’thavebought"indicatesthatbuyingtheumbrellawasnotrequired.6.Inthe8thunit,studentslearntouse"shouldhave+pastparticiple"toexpressregretaboutapastaction.Ifyoufailedthetestbecauseyoudidn’tstudy,youcansay,“I_______studiedharderforthetest.”Answer:shouldhaveExplanation:Thesentencerequires"shouldhave+pastparticiple"toexpressregretaboutapastinaction."Shouldhavestudied"indicateswhatyoushouldhavedonebutdidn’t.7.The8thunitintroduces"may+have+pastparticiple"todescribeapasteventaboutwhichthespeakerisnotcertain.Ifyouarenotsurewhetheryourfriendarrivedontime,youcansay,“He_______arrivedontimebecauseIdidn’tseehim.”Answer:mayhaveExplanation:Thesentencerequires"mayhave+pastparticiple"toexpressuncertaintyaboutapastaction."Mayhavearrived"suggestsapossibilitywithoutcertainty.8.Inthe8thunit,studentspracticeusing"could+have+pastparticiple"todescribeapastpossibilitythatdidnothappen.Ifyouhadmoretime,youcouldhavefinishedtheproject,butyoudidn’t.Youcansay,“I_______finishedtheprojectearlierifIhadmoretime.”Answer:couldhaveExplanation:Thesentencerequires"couldhave+pastparticiple"todescribeapastpossibilitythatwasnotactualized."Couldhavefinished"indicateswhatmighthavehappenedunderdifferentcircumstances.9.The8thunitteachestheuseof"must"toexpressnecessity.IfyourteachertellsyoutofinishyourhomeworkbeforewatchingTV,youcansay,“You_______finishyourhomeworkbeforewatchingTV.”Answer:mustExplanation:Thesentencerequires"must"toexpressastrongobligationornecessity."Mustfinish"indicatesthatfinishinghomeworkisrequired.10.Inthe8thunit,studentslearntouse"shouldn’t+have+pastparticiple"toexpressregretaboutapastaction.Ifyougaveyourfriendthewrongdirectionsandtheygotlost,youcansay,“I_______givenyoutherightdirections.”Answer:shouldn’thaveExplanation:Thesentencerequires"shouldn’thave+pastparticiple"toexpressregretaboutapastinaction."Shouldn’thavegiven"indicateswhatyoushouldhavedonebutdidn’t.三、判断题（总共10题，每题2分，共20分）1.Thesentence“Youmusthavegonetothestorebecauseyourbagisfull”correctlyuses“musthave+pastparticiple”toexpressalogicalconclusionaboutapastevent.Answer:TrueExplanation:Thesentencecorrectlyuses"musthave+pastparticiple"toinferapastactionbasedonpresentevidence(fullbag).2.Themodalverb“may”isusedtoexpresscertaintyaboutapastevent,while“might”isusedtoexpressuncertainty.Answer:FalseExplanation:Themodalverb"may"isusedtoexpresspossibilityoruncertainty,while"might"isusedtoexpressalowerlevelofcertainty.Thestatementisreversed.3.Thesentence“Youshouldtostudyeveryday”isgrammaticallycorrectforgivingadvice.Answer:FalseExplanation:Thesentenceisincorrectbecause"should"doesnotrequire"to"afterit.Thecorrectformis“Youshouldstudyeveryday.”4.Thestructure“can’t+have+pastparticiple”isusedtoexpressapastpossibilitythatdidnothappen.Answer:FalseExplanation:Thestructure"can’t+have+pastparticiple"isusedtoexpresscertaintyaboutapastactionthatdidnothappen,notpossibility.5.Thesentence“Shemighthaveseenyouattheschoolyesterday”correctlyuses“mighthave+pastparticiple”toexpressapastpossibility.Answer:TrueExplanation:Thesentencecorrectlyuses"mighthave+pastparticiple"tosuggestapossibilitywithlowcertainty.6.Themodalverb“needn’t”isusedtoexpressnecessity,while“needn’thave”isusedtoexpressunnecessaryactioninthepast.Answer:TrueExplanation:"Needn’t"expresseslackofnecessity,while"needn’thave+pastparticiple"expressesthatapastactionwasunnecessary.7.Thesentence“Youshouldhavestudiedharderforthetest”expressesregretaboutapastinaction.Answer:TrueExplanation:Thesentencecorrectlyuses"shouldhave+pastparticiple"toexpressregretaboutnotdoingsomethinginthepast.8.Themodalverb“may”isusedtoexpressastrongpossibilityaboutapastevent.Answer:FalseExplanation:"May"isusedtoexpresspossibilityoruncertainty,notstrongpossibility."Must"isusedforstrongpossibility.9.Thesentence“Hecan’thavegonetothestorebecauseheisherenow”correctlyuses“can’thave+pastparticiple”toexpresscertaintyaboutapastaction.Answer:TrueExplanation:Thesentencecorrectlyuses"can’thave+pastparticiple"toexpresscertaintyaboutapastactionthatdidnothappen.10.Thestructure“shouldn’thave+pastparticiple”isusedtogiveadviceaboutapastaction.Answer:FalseExplanation:"Shouldn’thave+pastparticiple"isusedtoexpressregretaboutapastaction,nottogiveadvice.四、简答题（总共8题，每题2分，共16分）1.Explainthedifferencebetween“must”and“haveto”inexpressingnecessity.Answer:-“Must”expressesstrongpersonalnecessityorobligationwithoutanauxiliaryverb(e.g.,“Youmustfinishyourhomework”).-“Haveto”requiresanauxiliaryverbandexpressesnecessityduetoexternalfactors(e.g.,“Youhavetofinishyourhomeworkbecauseyourteachersaidso”).Explanation:Thedifferenceliesintheformandsourceofnecessity."Must"ismorepersonal,while"haveto"isexternal.2.Describehow“may”and“might”areusedtoexpresspossibilityinthepast.Answer:-“Mayhave+pastparticiple”isusedtoexpresspossibilitywithmoderatecertainty(e.g.,“Shemayhaveseenyouatthestore”).-“Mighthave+pastparticiple”isusedtoexpresspossibilitywithlowcertainty(e.g.,“Hemighthavegonetothepartybutdidn’tcomeback”).Explanation:Thedifferenceliesinthelevelofcertainty."May"ismorelikely,while"might"islesslikely.3.Whyis“can’t+have+pastparticiple”usedtoexpresscertaintyaboutapastevent?Answer:-“Can’t+have+pastparticiple”isusedtoexpressstrongcertaintyaboutapastactionthatdidnothappen(e.g.,“Hecan’thavegonetothepartybecausehewasinbed”).Explanation:Thestructureisusedtoinferanegativepastactionbasedonstrongevidence.4.Howdoes“shouldhave+pastparticiple”differfrom“should+presentparticiple”ingivingadvice?Answer:-“Shouldhave+pastparticiple”expressesregretaboutapastinaction(e.g.,“Youshouldhavestudiedharder”).-“Should+presentparticiple”givesadviceaboutacurrentaction(e.g.,“Youshouldstudyharder”).Explanation:Theformerfocusesonpastregret,whilethelatterfocusesonpresentadvice.5.Whatisthepurposeofusing“needn’t+have+pastparticiple”inasentence?Answer:-“Needn’t+have+pastparticiple”isusedtoexpressthatapastactionwasunnecessary(e.g.,“Youneedn’thaveboughtanumbrellabecauseitdidn’train”).Explanation:Thestructurehighlightsthattheactionwasnotrequired.6.Describetheuseof“could+have+pastparticiple”todescribeapastpossibilitythatdidnothappen.Answer:-“Couldhave+pastparticiple”isusedtodescribewhatmighthavehappenedunderdifferentcircumstancesbutdidnot(e.g.,“IcouldhavepassedtheexamifIhadstudiedmore”).Explanation:Thestructureexpressesahypotheticalpastpossibility.7.Whyis“might+have+pastparticiple”usedtoexpressapastpossibilitywithlowcertainty?Answer:-“Mighthave+pastparticiple”isusedtosuggestapossibilitywithlowcertainty(e.g.,“Shemighthavearrivedlatebecausethetrafficwasbad”).Explanation:Thestructureindicatesuncertaintyaboutapastevent.8.Howdoes“shouldn’thave+pastparticiple”differfrom“shouldn’t+presentparticiple”inexpressingregret?Answer:-“Shouldn’thave+pastparticiple”expressesregretaboutapastinaction(e.g.,“Youshouldn’thaveeatentoomuch”).-“Shouldn’t+presentparticiple”expressesregretaboutacurrentaction(e.g.,“Youshouldn’teattoomuch”).Explanation:Theformerfocusesonpastregret,whilethelatterfocusesonpresentregret.五、应用题（总共8题，每题4分，共24分）1.Yourfriendtellsyou,“Ididn’tfinishmyhomeworklastnightbecauseIwastired.”Whatwouldyousaytoexpressregretusing“shouldhave+pastparticiple”?Answer:“Youshouldhavestudiedearliersoyouwouldn’tbetired.”Explanation:Theresponseuses"shouldhave+pastparticiple"toexpressregretaboutnotstudyingearlier,whichindirectlyaddressesthelackofhomeworkcompletion.2.Yourteachersays,“Youmusthavestudiedhardforthetestbecauseyourscoreimprovedsignificantly.”Howwouldyourespondusing“musthave+pastparticiple”toacknowledgetheteacher’sobservation?Answer:“Yes,ImusthavestudiedhardbecauseIreviewedallthenotes.”Explanation:Theresponseuses"musthave+pastparticiple"toagreewiththeteacher’sinferenceaboutyoureffort.3.Yourbrothersays,“Imighthavegonetotheparty,butI’mnotsure.”Howwouldyourespondtoexpresscertaintyusing“can’thave+pastparticiple”?Answer:“Youcan’thavegonetothepartybecauseyourcarwasn’tparkedoutside.”Explanation:Theresponseuses"can’thave+pastparticiple"tocontradictyourbrother’suncertaintybasedonevidence(nocar).4.Yourfriendsays,“Ineedn’thaveboughtanumbrellabecauseitdidn’train.”Howwouldyourespondtoagreeusing“needn’thave+pastparticiple”?Answer:“You’reright,youneedn’thaveboughtanumbrellabecausetheweatherwasclear.”Explanation:Theresponseuses"needn’thave+pastparticiple"toagreewiththefriend’sstatementaboutunnecessaryaction.5.Yourteachersays,“Youshouldhavesubmittedyourprojectontime,butyoudidn’t.”Howwouldyourespondusing“shouldhave+pastparticiple”toadmitfault?Answer:“Yes,Ishouldhavesubmitteditearlier,butIwasbusywithothertasks.”Explanation:Theresponseuses"shouldhave+pastparticiple"toacknowledgetheteacher’scriticismaboutlatesubmission.6.Yourfriendsays,“Imayhaveseenyouatthestoreyesterday,butI’mnotsure.”Howwouldyourespondtoexpresscertaintyusing“musthave+pastparticiple”?Answer:“YoumusthaveseenmebecauseIwaswearingmyredjacket.”Explanation:Theresponseuses"musthave+pastparticiple"toconfirmyourfriend’suncertaintybasedonevidence(redjacket).7.Yoursistersays,“ImighthavepassedtheexamifIhadstudiedmore.”Howwouldyourespondtoencourageherusing“shouldhave+pastparticiple”?Answer:“Youshouldhavestudiedmore,butdon’tworry,youcanimprovenexttime.”Explanation:Theresponseuses"shouldhave+pastparticiple"toencourageherwhileacknowledgingpastinaction.8.Yourfriendsays,“Ishouldn’thaveeatentoomuchlastnightbecauseIfeeluncomfortablenow.”Howwouldyourespondtoagreeusing“shouldn’thave+pastparticiple”?Answer:“You’reright,youshouldn’thaveeatentoomuchbecauseit’saffectingyourstomach.”Explanation:Theresponseuses"shouldn’thave+pastparticiple"toagreewiththefriend’sregretaboutovereating.【标准答案及解析】一、单项选择题1.C2.B3.C4.B5.B6.B7.B8.A9.B10.D二、填空题1.musthave2.should3.can’thave4.mighthave5.needn’thave6.shouldhave7.mayhave8.couldhave9.must10.shouldn’thave三、判断题1.True2.False3.False4.False5.True6.True7.True8.False四、简答题1.“Must”expressesstrongpersonalnecessitywithoutanauxiliaryverb,while“haveto”re