Unit 2 Let's celebrate!單元語法（情態(tài)動詞的用法總結）講義-高中英語外研版（2019）必修第二冊

Unit2Let'scelebrate!-單元語法（情態(tài)動詞的用法+總結）情態(tài)動詞的用法情態(tài)動詞＋動詞原形（一）can＋動詞原形：1．用于肯定句，表示客觀可能性，意為“可能”。-Asahumanbeing,anyonecanmakeamistake.-作為人類，任何人都有可能犯錯。2．用于否定句或疑問句，表示對現(xiàn)在的動作或狀態(tài)進行主觀的猜測。-Hecan＇thavealotofmoney.-他不可能有很多錢。-There'ssomeoneoutside-whocanitbe?-外面有人，會是誰呢？（二）may＋動詞原形：表示主觀的推測，意為“或許”，用于肯定句和否定句均可。-Hemaybeverybusynow.-他現(xiàn)在可能很忙。-Hemaynotbeathome.-他可能不在家。（三）might＋動詞原形：表示推測，意為“可能”，可以指過去的情況，也可以指現(xiàn)在的情況，但語氣比may更加不肯定。用于肯定句或否定句均可。-TheymighthavealotofworktodonowbutI'mnotsure.-他們現(xiàn)在可能有很多活兒要干，不過我不確定。-Shewasafraidtheymightnotliketheidea.-她擔心他們可能不喜歡這個想法。（四）could＋動詞原形意為“可能”，可以指過去的情況，也可以指現(xiàn)在的情況，語氣緩和。多用于否定句或疑問句。-Helooksyoung.Hecouldn'tbeover50.-他看起來很年輕，不可能超過50歲。-Coulditbetrue？-那可能是真的嗎？（五）must＋動詞原形表示猜測，意為“準是，一定”，通常用于肯定句。-Thismustbeyourroom.-這一定是你的房間。-Lookathisnewcar.Hemusthavealotofmoney.-瞧他那輛新車。他肯定很有錢。情態(tài)動詞＋完成式（一）must＋完成式：表示對已發(fā)生情況的推測，通常用于肯定句。-Itmusthaverainedlastnight,fortheroadisquitemuddy.-昨晚一定下雨了，因為路很泥濘。（二）can+完成式：表示對已發(fā)生情況的推測，主要用于否定句或疑問句?！oucan＇thaveforgottenher.-你不可能已經(jīng)忘記她了?！here'snowheretofindthem.Wherecantheyhavegone?-到處找不到他們，他們可能到什么地方去呢？（三）could＋完成式：表示對過去情況的推測，多用于否定句或疑問句。·Hecouldnothavebeenmorethan16atthattime.-他當時不可能超過16歲。-Couldshehaveforgottenmyaddress？-她會忘記我的地址嗎？（四）may／might＋完成式：表示對已發(fā)生事情的不肯定的推測，might相比may語氣更加不肯定。-Hemay／mighthavecomebytrain.-他可能是坐火車來的。單元語法習題練習（一）用方框內情態(tài)動詞或含情態(tài)動詞的結構并結合括號內所給詞填空： can,can'tdo,may/mightdo,maynotdo,mustdo,musthavedone,can'thavedone,may/mighthavedone1.Someone_____________(set)offfireworkslastnight，becausethegroundisfullofashes.2.Inpolarregions,people___________notseethesunforalongtime. 3.Tom_____________(wear)thatfancydress.Heisalwaysshy. 4.He_____________(be)theeditor.He'sexactlyliketheoneinthispicture. 5.He (finish)thatnovel.Hehasbeenbusytakingcareofhissickchildrecently.6.You______________(think)thatdecoratingthebuildingisawasteofcost,butI'msurelateryouwillbegratefulyoudidit. 7.Thatguy_____________(be)Peter-heisinhospital.8.Thesestudents______________(read)myblog,butI'mnotsure. 答案：1.musthaveset2.can.3.maynotwear4.mustbe5.can'thavefinished6.may/mightthink7.can'tbe8.may/mighthaveread（二）翻譯句子：1．他一定正在教室里做練習。（mustbedoing）___________________________________________________________________________.2．他不可能去了上海，剛才我還看見他了。（can’thavedone)__________________________________________________________________________.3．不要吃這些蘑菇，它們可能有毒。（coulddo）__________________________________________________________________________.4．他今天下午可能不來。（mightdo）___________________________________________________________________________.5．屋里很冷，他們一定把暖氣關了。（musthavedone）____________________________________________________________________________.6．布朗先生一向準時。這次開幕式他怎么可能遲到呢？(cando)_____________________________________________________________________________.答案：1.Hemustbedoinghisexercisesintheclassroom.2.Hecan'thavegonetoShanghaiforIsawhimaminuteago.3.Don'teatthesemushrooms.Theycouldbepoisonous.4.Hemightnotcomethisafternoon.5.Itiscoldintheroom.Theymusthaveturnedofftheheating.6.Mr.Brownisontimeforeverything.Howcanhebelatefortheopeningceremony?（三）語法填空：Tomwashavingclassintheclassroomwhensomeoneknockedatthedoor.“Who___1_____itbe?It2 betheheadteacher,becauseheisattendingameeting.It__3_____bemymathsteacher.”Hewaslostinthought.Whenthedoorwasopened,Tomfounditwashismother.“You4 havesomethingimportant,soyoucomehere,”Tomsaid.“Yes.Ican'tfindmykeys,andIthinklasttimeyouusedthemyoumay5 (misplace)them,”hismothersaid.Tomexplainedthatit6behim,andshemust7 (be)wrong.“8itbePeter?”Tomasked.“No,Petercan't9 (take)mykeysbecausehisownareinhisbag,”hismotheranswered.Suddenly,hismothersaidinexcitement,“Oh,yes,the