单元语法聚焦(八)

Unit8ItmustbelongtoCarla.单元语法聚焦(八)情态动词表示推测情态动词can，could，may，might，must都可以表示推测，表示说话人对事情发生的可能性的推测。其结构为“情态动词＋动词原形”。eg：Hemuststaythere.他一定待在那里。情态动词表示推测时，肯定句一般用mustbe(一定是，肯定是)，might/couldbe(可能是)；否定句用can'tbe(不可能是)；疑问句用can。1．must表示对现在的状态或现在正在发生的事情的推测时，must后面通常接系动词be的原形。eg：Youhavestudiedhardforfivehours.Youmustbetired.你已经学习了五个小时了，一定累了。2．“may/might/could＋动词原形”多用于肯定句形式，其“推测，判断”的语气不能确定，用may意为“也许；可能”；用might不表示过去时态，只表示语气较may更弱，意为“或许；大概”。eg：Idon'tknowwheresheis.ShemaybeinNewYork.我不知道她在哪儿，可能在纽约。TheguitarmightbeJane's.Sheplaystheguitar.这把吉他可能是简的。她弹吉他。ItcouldbeMei'shairband.这可能是梅的发带。3．“can/couldnot＋动词原形”用于否定句或疑问句中，表示“否定推测或判断”，有“不可能”之意。用can't还是用couldn't没有时态差异，只是can't的语气较couldn't强。eg：Thereisnolightintheroom.Shecan'tbeathomenow.房间里没有灯光。她现在不可能在家里。1．Thetextbook

beLiMing's.Ithashisnameonit.2．Thebeautifultrousers

beJim's.Theyaretoolong.3．Thelargeshoes

beMary's.Shehassmallfeet.4．Thefootball

beWeiHua'sorTianHui's.Theybothplayfootball.5．Theguitar

belongtoSam.Heoftenplaystheguitar.mustcan'tcan'tmight/maymust二、单项选择。()6.—Istillhaven'tfoundmypetdog.(2016·武汉)—I'msorrytohearthat.You________beverysad.A．mayB．mustC．shouldD．can't()7.—Who'ssinginginthegarden?—It________beMr.Brown.Healwayspracticessingingatthistime.A．mustB．can'tC．need()8.—Whereareyougoingthismonth？(2016·呼和浩特)—We________gotoXiamen，butwe'renotsure.A．needn'tB．mightC．mustD．mustn'tBAB()9.—WhoseT­shirtisthis?—It________beJohn's.It'smuchtoosmallforhim.A．mightB．can'tC．needn't()10.—Excuseme，whenarewegoingtohaveapicnic?—I'mnotsure.Askourmonitor，please.He________know.A．needB．canC．mayD．mustBC三、按要求完成句子，每空一词。11．ThebeautifulcoatisMike's_sister's．(对画线部分提问)_____________________thebeautifulcoat?12．TheEnglishbookmustbeSally's.(改为同义句)TheEnglishbookmust_____________________Sally.13．ThispersonmustbeaChineseteacher.(改为否定句)Thisperson____________beaChineseteacher.Whose

isbelong

tocan't14．她不可能正在实验室等着你。(翻译句子)She__________________________foryouinthe_______________.15．你昨晚熬夜了，现在一定困倦了吧。(翻译句子)You__________________________nowafteryourstayinguplateyesterday.can't

be

waiting

laboratorymust

be

sleepy四、用must，might，can，could或can't完成下列对话。A：Tina，youlookworried.What'swrong?B：Ican'tfindmyEnglishbook.Where16.__________itbe？I17._______havelostit.A：Don'tworry.Let'sseewhereit18.______________be.B：IthinkI19.____________leaveitinthereadingroom.Butitisn'tthere.A：Whatdoesyourbooklooklike？Let'slookforittogether.B：It'sblu