Unit2Let'sCelebrate!Usinglanguage課件高一英語

Unit2Book2Let’scelebrate!Usinglanguage:GrammarReviewInUnit1,we’velearnedthefollowingmodals:beabletodarehadbetterneedhavetoThatiswhyLettersfromFatherChristmascouldbetheperfectbook.Theymightnotreceivetheirpresentsiftheywerenotgood.Thechildrenmusthavebeenveryexcitedastheyopenedit.Whatdothewordsinboldindicate:anorder?arequest,abilityorpossibility?possibilityPresentation.情態(tài)動詞表推測

must,can,could,may,might情態(tài)動詞表推測情態(tài)動詞+動詞原形情態(tài)動詞+完成式（表示對目前/將來的動作或狀態(tài)進(jìn)行推測）（表示對過去情況的推測）情態(tài)動詞must,can/could,may/might均可表示推測,它們可以對過去、現(xiàn)在或?qū)淼那闆r作出語氣強(qiáng)弱不同的推測。（對此時此刻正在進(jìn)行的情況進(jìn)行推測）情態(tài)動詞+be+動詞ing形式1.

對現(xiàn)在或?qū)淼那闆r進(jìn)行推測時，用“情態(tài)動詞+do”。YoumustbeMr.Smith.Iwastoldtoexpectyou.Ourteammightwintherace.3.

對過去的情況進(jìn)行推測時，用“情態(tài)動詞+havedone”。2.

對此時此刻正在進(jìn)行的情況進(jìn)行推測時，用“情態(tài)動詞+be+動詞-ing形式”。Shemaybewaitingforyouintheentrancehallatthemoment.Thepolicearestoppingallcars.Theymustbelookingfor

the

escapedprisoner.Presentation.情態(tài)動詞表推測

Itmusthaverainedlastnight,forthegroundiswet.情態(tài)動詞+動詞原形情態(tài)動詞肯定式否定式疑問式must準(zhǔn)是，一定//can可能can’t不可能有可能嗎could可能couldn’t不可能語氣比can弱may或許，也許，說不定maynot可能不/might或許，也許（比may弱）mightnot可能不/Lookathisnewcar.Hemusthave

alotofmoney.Asahumanbeing,anyonecanmakeamistake.Hecouldbeonhiswayhome.Hemaybeverybusynow.TheymighthavealotofworktodonowbutI’mnotsure.1.表示肯定的推測時：各情態(tài)動詞語氣從弱到強(qiáng)依次為might<may<could<can<must；--Canthenewsbetrue?--Itcan’tbetrue.Itmaynotbeagreatsuggestion.2.表示否定的推測時：

can’t/couldn’t語氣較強(qiáng)“不可能”；

maynot/mightnot語氣較弱“可能不”。1.Heisright.2.Hemustberight.3.Hecan

beright.4.Hecouldberight.5.Hemayberight.6.Hemightberight.musthavedone過去一定。表示對已經(jīng)發(fā)生的事情的肯定推測，語氣較強(qiáng)。egItmusthaverainedlastnight.Thegroundiswet.

情態(tài)動詞+havedone

should/oughttohavedone過去不可能做過。表示對過去發(fā)生的事情的否定推測。egTheycan’thavegoneout,becausethelightison.can’t/couldn’thavedonePresentation.情態(tài)動詞表推測

may/mighthavedone可能已經(jīng)。表示對已經(jīng)發(fā)生過的情況的肯定推測，語氣稍弱。egHe

may/mighthavegivenyoumorehelp,eventhoughhewasbusy.否定形式：may/mightnothavedone過去可能沒有做過couldhavedone本應(yīng)該（卻沒有做）。含有責(zé)備或后悔之意。egTheyshouldhavefinished

theirworkbeforeplaying.should/oughttohavedone本可以。表示過去本來能夠做某事而實(shí)際上沒有做。egHecouldhavepassed

theexam,buthewastoocareless.Presentation.情態(tài)動詞表推測

否定形式：shouldnothavedone本不該做卻做了oughtnottohavedonePresentation.情態(tài)動詞表推測

needn’thavedone本沒有必要做（卻做了）。多用于否定句中。egLook,it’srainingnow.Youneedn’thavewatered

theflowers.①Ididn’thearyoucall.Imust

havebeenasleepatthattime.我沒聽到你打電話。那時候我肯定已經(jīng)睡著了。②Youcouldn’thavefinishedsomuchworkinsoshortatime.你們不可能在這么短的時間內(nèi)完成這么多的工作。③It’stoolate.Ithinkhemayhavegonetobed.太晚了，我想他可能已經(jīng)上床睡覺了。④Tomfailedtheexam.Hemaynothavereviewedtheknowledge.湯姆沒通過考試。他可能沒有復(fù)習(xí)知識。⑤Youcouldhavedonebetter,butyouweretoocareless.你本可以做得更好的，但你太粗心了。⑥Lookatthetime!Weshouldhavebeenatthecinematenminutesago.看看什么時候了！我們本該十分鐘前到電影院的。⑦Heshouldn’thavemadesuchadicision.他本不該做這樣一個決定的。⑧Asitturnedouttobeasmallhouseparty,weneedn’thavedressedup.正如結(jié)果所顯示的那樣，這是一個小型家庭聚會，我們本不必打扮得如此正式。翻譯句子。Theymay/might/couldbefromourschool.Youmustbetirednow!Itmay/might/couldbehim.Thatmustbelucy.thatcan'tbeLucy.waveat招手bedressedas喬裝打扮fancydresspartyBatmanbride

wordbandPractice.Rewritetheunderlinedsentences

usingcan/could,may/mightandmust.

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

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

Hemaynot.No.1Suspectmay用于肯定句的猜測?？赡苄詾?0%

Pairwork.Observeandanswer:Whodoyouthinkisthekiller?Why?There

wasaknifeonhistable.Hecouldn’tbethekiller.No.2Suspectcan/could表懷疑常用于否定句或疑問句中。can’t可能性為0%。Pairwork.Observeandanswer:Whodoyouthinkisthekiller?Why?Shecouldenterladiesroomeasily.She

hadabag,soshecouldhidetheknifeinherbag.Shemightbethekiller.No.3Suspectmight用于肯定句的猜測?？赡苄员萴ay小，為30%。Pairwork.Observeandanswer:Whodoyouthinkisthekiller?Why?Hisknifewasn’tonhistable.Therewasascaronhisneck.Hemust

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