新编英语教程第三版第二册unit 3文档格式.docx

新编英语教程第三版第二册unit 3文档格式.docx

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needn’t+perfectinfinitiveexpressing“unnecessarypastactions”

.1）Sheshould/oughttohavehadmoreoralpracticeduringtheterm.

2）Sheneedn’thavelearnedallthedialoguesbyheart.

3.may/might+perfectinfinitiveusedtoexpress“speculationsaboutpastactions”

can/couldnot+perfectinfinitiveusedtoexpress“negativedeductionaboutpast

actions”

.1）Hemay/mighthavegonetothelibrary.

2）Shecan’t/couldn’thavegonetothelibrary.

4.must+perfectinfinitiveusedtoexpress“affirmativedeductionaboutpastactions”

may/mightaswellusedwiththesecondpersonpronounexpressing“suggestions”

.1）Shemusthavegonetothelanguagelab.

2）Youmay/mightaswellusemybike.

PreparatoryQuestions

Directions:

Recastthefollowingsentencesusingthefollowingphrases:

1.“wouldhavelikedto（do）”

Notice:

　wouldhavelikedto（do）　is　usedwiththefirstpersontoexpressthespeaker’swishthatwasnotfulfilled．

1）IintendedtogoskatingwithyouyesterdaybutIcouldn’tbecausemymotherdidn’tletme.

（Response:

Iwouldhavelikedtogoskatingwithyouyesterday,butmymotherdidn’letme.）

2）ImeanttositinonProfessorWang’sclassthismorningbutIdidn’tbecauseIhadanimportantmeetingtoattend.

IwouldhavelikedtositinonProfessorWang’sclassthismorning,butIhadanimportantmeetingtoattend.）

3）IintendedtotakepartinthebasketballmatchyesterdayafternoonbutIcouldn’t

becauseIhadabadfallyesterdaymorning.

Iwouldhavelikedtotakepartinthebasketballmatchyesterdayafternoon,butIhadabadfallyesterdaymorning.）

4）Iplannedtolendyoumycassetterecorder,butIdidn’t,becauseitwasoutoforder.

Iwouldhavelikedtolendyoumycassetterecorder,butitwasoutof

order.）

2.should/oughtto+perfectinfinitive

　should/oughtto+perfectinfinitive,indicatingapastobligationthatwasnotfulfilled

1）Theexhibitionwasagoodone.AllofusvisiteditexceptJohn.

:

Johnshould/oughttohavecomewithus.）

2）Wealllearnedalotfromthelecture,butLididn’tattendit.

Lioughtto/shouldhaveattendedthelecture.）

3）Theengineerwenttotheresearchinstitutewithoutanumbrellaandwascaughtintherain.

Theengineeroughtto/shouldhavetakenanumbrellawithhim.）

4）TheyboughtabookforMarybutshedidn’tlikeit.

Theyoughtn’tto/shouldn’thaveboughtthebookforMary.）

needn’t+perfectinfinitive

needn’t+perfectinfinitive,indicatingsomethingthatwasunnecessarilydoneinthepast

1）Iwroteasummaryinmorethanfivehundredwords.Buttheteacheronlyaskedfor

200words.

Ineedn’thavewrittensuchalongsummary.）

2）Linansweredallthetenquestionsinthetestpaper.Butwewereonlyrequiredto

answereightofthem.

Linneedn’thaveansweredallthetenquestionsinthetestpaper.）

3）Marywenttothestationanhourbeforethetrainstarted.

Maryneedn’thavegonetothestationsoearly.）

4）Yaocarriedalltheparcelshomeherself.Shedidn’tknowtheywoulddeliverthemifsheaskedthem.）

Yaoneedn’thavecarriedalltheparcelshomeherself.Theywouldhave

deliveredthemifshehadaskedthem.）

3．may/might+perfectinfinitive

may/might+perfectinfinitive,indicatingspeculationsaboutpastactions

1）WhereisSusanIwanttogotothecanteenwithher.

Shemay/mighthavegonetherealready.）

2）It’safortnightsinceSunwenttotheSouthandwehaven’tgotawordfromhim.I

wonderifhe’sforgottenusall.

Hemay/mighthavebeenverybusywithhisworkthere.）

3）Sidtoldmehe’dletmehavethelibrarybookafterhe’dfinishedwithit.It’saweek

sincehesaidthatandhestillhasn’tgivenmethebook.

Hemay/mighthavereturnedthebooktothelibrary.

4）I’vebeenlookingformybicyclekeyforthreedays,andit’sstillnowheretobefound.

Youmay/mighthavelostit.）

can’t/couldn’t+perfectinfinitive

can’t/couldn’t+perfectinfinitive,indicatingnegativedeductionaboutpastactions

Thefirstpartoftheresponsecanbegiventothestudentsasaprompt.

1）WhereismytypewriterSomeonemusthavestolenitlastnight.

Itwashereamomentago.Itcouldn’thavebeenstolenlastnight.）

2）Keithoughttobeherenow.Perhapshe’slosthisway.

ItoldhimhowtocomeandIevendrewhimamap.Hecan’thavelosthisway.）

3）WhobroughttherefrigeratorupstairsPe