Unit2Let'sCelebrate!Usinglanguage课件高一英语

Unit2Book2Let’scelebrate!Usinglanguage:GrammarReviewInUnit1,we’velearnedthefollowingmodals:beabletodarehadbetterneedhavetoThatiswhyLettersfromFatherChristmascouldbetheperfectbook.Theymightnotreceivetheirpresentsiftheywerenotgood.Thechildrenmusthavebeenveryexcitedastheyopenedit.Whatdothewordsinboldindicate:anorder?arequest,abilityorpossibility?possibilityPresentation.情态动词表推测

must,can,could,may,might情态动词表推测情态动词+动词原形情态动词+完成式（表示对目前/将来的动作或状态进行推测）（表示对过去情况的推测）情态动词must,can/could,may/might均可表示推测,它们可以对过去、现在或将来的情况作出语气强弱不同的推测。（对此时此刻正在进行的情况进行推测）情态动词+be+动词ing形式1.

对现在或将来的情况进行推测时，用“情态动词+do”。YoumustbeMr.Smith.Iwastoldtoexpectyou.Ourteammightwintherace.3.

对过去的情况进行推测时，用“情态动词+havedone”。2.

对此时此刻正在进行的情况进行推测时，用“情态动词+be+动词-ing形式”。Shemaybewaitingforyouintheentrancehallatthemoment.Thepolicearestoppingallcars.Theymustbelookingfor

the

escapedprisoner.Presentation.情态动词表推测

Itmusthaverainedlastnight,forthegroundiswet.情态动词+动词原形情态动词肯定式否定式疑问式must准是，一定//can可能can’t不可能有可能吗could可能couldn’t不可能语气比can弱may或许，也许，说不定maynot可能不/might或许，也许（比may弱）mightnot可能不/Lookathisnewcar.Hemusthave

alotofmoney.Asahumanbeing,anyonecanmakeamistake.Hecouldbeonhiswayhome.Hemaybeverybusynow.TheymighthavealotofworktodonowbutI’mnotsure.1.表示肯定的推测时：各情态动词语气从弱到强依次为might<may<could<can<must；--Canthenewsbetrue?--Itcan’tbetrue.Itmaynotbeagreatsuggestion.2.表示否定的推测时：

can’t/couldn’t语气较强“不可能”；

maynot/mightnot语气较弱“可能不”。1.Heisright.2.Hemustberight.3.Hecan

beright.4.Hecouldberight.5.Hemayberight.6.Hemightberight.musthavedone过去一定。表示对已经发生的事情的肯定推测，语气较强。egItmusthaverainedlastnight.Thegroundiswet.

情态动词+havedone

should/oughttohavedone过去不可能做过。表示对过去发生的事情的否定推测。egTheycan’thavegoneout,becausethelightison.can’t/couldn’thavedonePresentation.情态动词表推测

may/mighthavedone可能已经。表示对已经发生过的情况的肯定推测，语气稍弱。egHe

may/mighthavegivenyoumorehelp,eventhoughhewasbusy.否定形式：may/mightnothavedone过去可能没有做过couldhavedone本应该（却没有做）。含有责备或后悔之意。egTheyshouldhavefinished

theirworkbeforeplaying.should/oughttohavedone本可以。表示过去本来能够做某事而实际上没有做。egHecouldhavepassed

theexam,buthewastoocareless.Presentation.情态动词表推测

否定形式：shouldnothavedone本不该做却做了oughtnottohavedonePresentation.情态动词表推测

needn’thavedone本没有必要做（却做了）。多用于否定句中。egLook,it’srainingnow.Youneedn’thavewatered

theflowers.①Ididn’thearyoucall.Imust

havebeenasleepatthattime.我没听到你打电话。那时候我肯定已经睡着了。②Youcouldn’thavefinishedsomuchworkinsoshortatime.你们不可能在这么短的时间内完成这么多的工作。③It’stoolate.Ithinkhemayhavegonetobed.太晚了，我想他可能已经上床睡觉了。④Tomfailedtheexam.Hemaynothavereviewedtheknowledge.汤姆没通过考试。他可能没有复习知识。⑤Youcouldhavedonebetter,butyouweretoocareless.你本可以做得更好的，但你太粗心了。⑥Lookatthetime!Weshouldhavebeenatthecinematenminutesago.看看什么时候了！我们本该十分钟前到电影院的。⑦Heshouldn’thavemadesuchadicision.他本不该做这样一个决定的。⑧Asitturnedouttobeasmallhouseparty,weneedn’thavedressedup.正如结果所显示的那样，这是一个小型家庭聚会，我们本不必打扮得如此正式。翻译句子。Theymay/might/couldbefromourschool.Youmustbetirednow!Itmay/might/couldbehim.Thatmustbelucy.thatcan'tbeLucy.waveat招手bedressedas乔装打扮fancydresspartyBatmanbride

wordbandPractice.Rewritetheunderlinedsentences

usingcan/could,may/mightandmust.

Book2Unit2ModelverbsdetectivePairwork.Observeandanswer:Whodoyouthinkisthekiller?Why?Usingthemodelverbs:must,can/could,may/mightThewomenmustbedead.Shemusthavebeenkilled.Thecasecouldn’thavebeen

asuicide自杀.Therewerefoursuspects,andoneofthemmustbethekiller.crimescenePairwork.Observeandanswer:Whodoyouthinkisthekiller?Why?Wecouldn’tgetmuchinformationabouthim.Hemaybethekiller.

Hemaynot.No.1Suspectmay用于肯定句的猜测。可能性为50%

Pairwork.Observeandanswer:Whodoyouthinkisthekiller?Why?There

wasaknifeonhistable.Hecouldn’tbethekiller.No.2Suspectcan/could表怀疑常用于否定句或疑问句中。can’t可能性为0%。Pairwork.Observeandanswer:Whodoyouthinkisthekiller?Why?Shecouldenterladiesroomeasily.She

hadabag,soshecouldhidetheknifeinherbag.Shemightbethekiller.No.3Suspectmight用于肯定句的猜测。可能性比may小，为30%。Pairwork.Observeandanswer:Whodoyouthinkisthekiller?Why?Hisknifewasn’tonhistable.Therewasascaronhisneck.Hemust

bethekiller.No.4Suspectmust表示推测时，只能用于肯定句。可能性为100%。Pairwork.Observeandanswer:Whodoyouthinkisthekiller?Why?No.4Suspectcouldhavedone本可以做某事Icouldhavetalkedwithherpeacefully.HomeworkViewing.Haveyoueverheardof“BlackFriday”?BlackFridayisoneofthebusiestshoppingdaysoftheyear.Storeshavebigsalesandopentheirdoorsveryearly.Production.Lookatthepictureandmakeasmanysentencesaspossibleusingcan/could,may/mightandmu