Unit+1+Food+for+thought+Using+language+学案 高中英语外研版（2019）必修第二册

B2U1Usinglanguage—Modals(1)语法感知：1．...Iwasabletoholdaknifeandfork—andchopsticks!2．ButtherearestillsomedishesthatDaddarenottryevenaftermanyyearsofmarriagetomymother.3．...MumandIjusthavetofindawaytogethimintothekitchen!4．...we'dbetternoteattoomuchroastfoodasitmaymakeussufferfromheatinsideourbodies...5．“Youneedn'ttryitifyoudon'twantto，”Mumsaid...Summary:1．情态动词有____________，但不能______________，需和_________________一起作谓语。2.情态动词的否定式：________________________，如：句2,4,5。3.情态动词后接___________________。4.情态动词一般无_______和______的变化，个别情态动词有现在时和过去时两种时态变化。有些情态动词如beableto，haveto有和的变化，如句1,3。1．can与beableto(1)can只有现在时和过去时(could)两种时态:can-couldbeableto则有更多的时态变化，在非谓语动词中只能用beableto。Willyoubeabletocometomypartytomorrow?Beingabletocommunicateideasinameaningfulwayisavaluableskill.(2)can一般指自身具有的能力，beableto则表经过一段时间的努力后所具有的能力(相当于managetodo或succeedindoing)Thegirlcan'tanswerthequestion.Ifyoukeeppracticing，youwillbeabletoplaybasketballwell.(3)在否定结构中was/wereableto与could没有区别Sheranfastbutshewasn'tableto/couldn'tcatchthebus.2．need的用法(1)need作情态动词时，后跟动词原形，表“需要，有必要”，无人称和数的变化，多用于疑问句、否定句或条件句中。—NeedIfinishtheworktoday?—Yes，youmust/haveto./No，youneedn't.There'splentyoftime.Youneedn'tdrivesofast.注：由need引起的一般疑问句，肯定回答常用must或haveto；否定回答常用needn't。(2)need作实义动词时，后可接名词、动名词、不定式等，有人称、时态和数的变化。短语：sbneedtodosth.Sthneeddoing=sthneedtobedoneYouneed__________________(practice)speakingEnglishmoreoften.Mywatchdoesn'tworkandneeds________________________________(repair).3．haveto与must(1)haveto表“不得不”，有时态、人称和数的变化，其否定式为don't/doesn't/didn'thaveto。It'stoolate.Ihavetogohomenow.Youdon'thavetofinishtheworknow.(2)haveto表一种客观的需要，而must表一种主观的需要。Ihavetoattendanimportantmeetingthisafternoon.Youmustobeytherulesofyourschool.(3)must表“偏偏，偏要，非得”，常指不愉快的事。Mustyoumakesomuchnoise?4．dare的用法(1)dare作情态动词时，多用于疑问句、否定句、条件状语从句以及表怀疑的名词性从句中，表“敢……”。Idarenotwalkthroughthewoodatnight.—Dareyoucatchthemouse?—No，Idaren't.Idon'tknowwhetherhedaretryit.(2)dare作实义动词时，在否定句、疑问句中，不定式符号to也可以省略。Thechildrendon'tdare(to)makeasoundwhiletheirparentsaresleeping.Doeshedare(to)tellyouwhathehasdone?5．hadbetter的用法hadbetter后跟动词原形，表示“最好……”，其否定式是在hadbetter后加not。You'dbettergettherebeforeitgetsdark.We'dbetternottalksoloudly.Practice——语段选词填空：eq\x(may，dare，could，mustn't，beableto，must，hadto，hadbetter，should，needn't)I1._____________notreadwithmyeyespainful.MyroommatesuggestedIshouldhaveaneyeexamination.“You2._____________gotothehospitalandthedoctor3._____________helpyoufindoutwhy，”hesaid.WhenIarrivedatthehospital，Ifoundmanypeoplewaitingthere.SoI4._____________waitformyturn.Whenitwasmyturn，thedoctorexaminedmyeyescarefullyandsaid，“I5._____________sayyoudon'tprotectyoureyeswell.Butyou6._____________worryaboutit.Usesomemedicineandyou7._____________mustn'tmakeyoureyessotired，andsoonyouwill8._____________recover.”Isaidtomyself，“I9.______