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

Unit2Let’scelebrate-UsingLanguage汇报人：Andy

Step1.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)Itcantsnowinsummer.(2)Wemightnotgoanywhere.※mustn’t表示“禁止”，不用于否定推测。Youmustnttellalietoparents.

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)Hecantbeathomeatthistime.(=Idontthinkheisathomeatthistime.)(2)Theymaynotbehavingfun.(=Idontthinktheyarehavingfun.)(3)Hemustworkveryhard.(=Imsurehegenerallyworksveryhard.)

②“情态动词+have+V-ed”表达对过去情况的推测。(1)Theymay/mighthavegotlost.(2)Emmamusthavebeenveryupset.(3)Hecanthaveleftsosoon.

③“情态动词+动词原形”表达对将来情况的推测。(1)Shemustarrivebefore5.(=Imsureshewillarrivebefore5.)(2)Shemaywalkmilesandmilesamongthehillswithoutmeetinganyone.(=Itsprobablethatshewalkmilesandmilesamongthehillswithoutmeetinganyone.