Unit+2+Let's+Celebrate!+Using+language+Grammar+情態(tài)動詞課件 高一英語外研版（2019）必修第二冊

Unit2Let’scelebrate-UsingLanguage匯報人：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情態(tài)動詞must,can,could,may,might等都有表推測的用法Step2根據(jù)推測語氣的強弱，選擇情態(tài)動詞①在肯定句中表推測:

must語氣最強，表示“肯定，一定”；could,may,might語氣依次減弱，表示“可能，也許”(1)Youmusttellmeallaboutyournewfriend.(2)Hecouldbeathome.Hemaybeathome.Hemightbeathome.

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

③在疑問句中表推測:疑問句中用can/could（能……？），could語氣更加委婉不確定。(1)Couldhehavefinishedthetask?(2)Canhebeathomenow?情態(tài)動詞表推測的三種時態(tài)①“情態(tài)動詞+be/bedoing/動詞原形”表達對現(xiàn)在情況或此時此刻正在發(fā)生的事情的推測。(1)Hecan'tbeathomeatthistime.(=Idon'tthinkheisathomeatthistime.)(2)Theymaynotbehavingfun.(=Idon'tthinktheyarehavingfun.)(3)Hemustworkveryhard.(=I'msurehegenerallyworksveryhard.)②“情態(tài)動詞+have+V-ed”表達對過去情況的推測。(1)Theymay/mighthavegotlost.(2)Emmamusthavebeenveryupset.(3)Hecan'thaveleftsosoon.③“情態(tài)動詞+動詞原形”表達對將來情況的推測。(1)Shemustarrivebefore5.(=I'msureshewillarrivebefore5.)(2)Shemaywalkmilesandmilesamongthehillswithoutmeetinganyone.(=It'sprobablethatshewalkmilesandmilesamongthehillswithoutmeetinganyone.)情態(tài)動詞表推測時的反意疑問句、附加疑問句部分一般不再用情態(tài)動詞表示推測語氣。而是根據(jù)情態(tài)動詞之后的動詞及時間狀語或上下文確定具體形式。(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