Unit+2+Let's+Celebrate!+Using+language+Grammar+情态动词课件 高一英语外研版（2019）必修第二册

Unit2Let’scelebrate-UsingLanguage汇报人：AndyStep1.Fillintheblankswithappropriatewordsaccordingtothetext.1.Theletterswerealsobeautifully-illustrated-each_______________(take)itstrueauthor,Tolkien,alongtimetocomplete.2.Inanotherletter,FatherChristmascomplainedabouthowhe____________(stop)hishelpersplayinggameswiththetoysinsteadofwrappingthemup.3....othercharactersattheNorthPole,we___________(share)thetruespiritofgivingatChristmastime.4....Tolkien______________(be)therealFatherChristmas.musthavetakencoudnotstopcansharemayhavebeen情态动词must,can,could,may,might等都有表推测的用法Step2根据推测语气的强弱，选择情态动词①在肯定句中表推测:

must语气最强，表示“肯定，一定”；could,may,might语气依次减弱，表示“可能，也许”(1)Youmusttellmeallaboutyournewfriend.(2)Hecouldbeathome.Hemaybeathome.Hemightbeathome.

②在否定句中表推测:can’t,couldn’t语气较强，表示“不可能”；may/mightnot语气较弱，表示“可能不”；(1)Itcan'tsnowinsummer.(2)Wemightnotgoanywhere.※mustn’t表示“禁止”，不用于否定推测。Youmustn'ttellalietoparents.

③在疑问句中表推测:疑问句中用can/could（能……？），could语气更加委婉不确定。(1)Couldhehavefinishedthetask?(2)Canhebeathomenow?情态动词表推测的三种时态①“情态动词+be/bedoing/动词原形”表达对现在情况或此时此刻正在发生的事情的推测。(1)Hecan'tbeathomeatthistime.(=Idon'tthinkheisathomeatthistime.)(2)Theymaynotbehavingfun.(=Idon'tthinktheyarehavingfun.)(3)Hemustworkveryhard.(=I'msurehegenerallyworksveryhard.)②“情态动词+have+V-ed”表达对过去情况的推测。(1)Theymay/mighthavegotlost.(2)Emmamusthavebeenveryupset.(3)Hecan'thaveleftsosoon.③“情态动词+动词原形”表达对将来情况的推测。(1)Shemustarrivebefore5.(=I'msureshewillarrivebefore5.)(2)Shemaywalkmilesandmilesamongthehillswithoutmeetinganyone.(=It'sprobablethatshewalkmilesandmilesamongthehillswithoutmeetinganyone.)情态动词表推测时的反意疑问句、附加疑问句部分一般不再用情态动词表示推测语气。而是根据情态动词之后的动词及时间状语或上下文确定具体形式。(1)Thatgirlmustbeyoursister,isn’tshe?(2)Hemusthaveleftyesterday,didn’the?WPS,aclicktounlimitedpossibilitiesLet’spractice!YOURLOGOYoumustbefeelingtirednow.Itmay/might/couldbehim.ThatmustbeLucy!Thatcan’tbeLucy.Theymay/might/couldbefromourschool.Rewritetheunderlinedsentencesintheconversationusingcan/could,may/mightandmustThewomaninredmustbeveryexcitedtobuysomanythings.Themanwithawalletinhishandmightbeabitreluctanttopay.Thewomanwithglasses