GrammarFocus-4cUnit8ItmustbelongtoCarla.Bytheendoftheclass,youwillbeableto:

1.use“must;could/might;can’t”correctly

正確使用

must;could/might;

can’t2.makeinferencebyusing“must;could/might;can’t.”

ItmustbeCarla’s.Shelovesvolleyball.

ItcouldbeMei’shairband.OritmightbeLinda’s.Theybothhavelonghair.I’mnotsure,butitcan’tbeadog.LearningobjectivesWarmupGuessingGameI’mLily.Ilikedancing.Lily_______________beadancerwhenshegrowsup.could/may/might此處could/might/may表示推斷，意為“可能”，通常與be連用。Fillintheblankswithmodalverbs.GuessingGameThisfootball_____beLily’s.It______beLiMing’s.can’tmust此處can’t表示推斷，意為“不可能”。通常與be連用。(否定推測用can't)I’mLiMing.Ilikeplayingfootball.Itmustbeveryexpensive.Thepeoplewhodoitmustbeveryfit.Thatmightbefun.Itmaybetoochallengingforus.Itcouldbedangerous.Itcan'tbethatdangeroustogoonsafari.Somanypeopledoit.Lookatthesesentences.情態動詞表推測Lead-in情態動詞must，can，could，may和might均可表示推測，可以對過去、現在或將來的情況作出語氣強弱不同的推測。Whosevolleyballisthis?ItmustbeCalar's.Shelovesvolleyball.Whosehairbandisthis?ItcouldbeMei'shairband.OritmightbelongtoLinda.Theybothhavelonghair.Whatdidyouseethatnight?I'mnotsure,butitcan'tbeadog.Itwasbigger.Ithinkitmightbeabearorawolf.GrammarFocus情態動詞mustcancouldmaymight情態動詞表推測大小can't約100%20%-80%possiblytrue幾乎0almostnottrue句式情態動詞含義用法肯定句must一定表示有把握的肯定推測。may/might/could也許；可能表示沒有把握的肯定推測。否定句can’t/couldn’t不可能表示有把握的否定推測。maynot/mightnot可能不表示不太有把握的肯定推測。疑問句can/could可能表示推測。情態動詞表示推測的意義和用法可能性mightmaycouldcanmustcan't0%-100%不可能也許，可能(4個)肯定,一定表示推測的情態動詞肯定句：mustmay/might/could一定也許可能表示有把握的肯定推測表示沒有把握的肯定推測否定句：can't/couldn't不可能表示有把握的否定推測maynot/mightnot可能不表示不太有把握的否定推測疑問句：can/could可能表示推測Hemustbeveryhappywhenheheardthenews.Hemaybeinhisoffice,butI'mnotsure.Thatmancan'tbeyourteacher.Heismuchtaller.情態動詞表推測的用法CouldMissListillbeourmathteacherthisterm？注意：含有must的句子變為否定句時，要用can'tHemustbeathome.他一定在家。→Hecan'tbeathome.他不可能在家。(1)“情態動詞+動詞原形”，表示對現在的事情的推測。我不知道她在哪兒。她可能在武漢。I

don’t

know

where

she

is.She

may

be

in

Wuhan.(2)“情態動詞+be+動詞-ing形式”，表示對正在進行

的事情的推測。那個穿著西裝的男人也許正跑著去趕公共汽車。The

man

in

a

suit

might

be

running

to

catch

abus.(3)“情態動詞+have+動詞的過去分詞”，表示

對過去或已經完成的事情的推測。地是濕的，一定是下過雨了。The

ground

is

wet.

It

must

have

rained.拓展mustcan’t

may/might/could

may/might/couldcan’t1.A:Where’sJean?B:I’mnotsure.She_________(is/mightbe/mustbe)inthelaboratory.2.A:Everyoneisgoingtothepoolafterschool.B:Really?It_________(mustbe/can’tbe/couldbe)hotoutdoors.3.A:That’sthephone.B:Hmm.Iwonderwhoit________(mustbe/couldbe/shouldbe).4.A:IwonderiftheseareJim’sglasses.B:They________(can’tbe/mightbe/couldbe)his.Hedoesn’twearglasses.5.A:Ihearwaterrunninginthebathroom.B:It_________(couldbe/mustbe/can’tbe)Carla.Shewasthinkingoftakingashower.4amightbemustbecouldbecan’tbemustbeExercises1.A:Manypeoplearewearingcoats.B:Theweathermustbe_________________________.2.A:Sallyhasbeencoughingalot.B:Shemightbe

_________________________.gettingcolder/coldoutsidehavingasorethroat/ill4bCompletetheseresponses.根據推測詞，補充說明理由3.A:Thisrestaurantisalwaysverycrowded.B:Thefood________________.4.A:WheneverItrytoreadthisbook,Ifeelsleepy.B:Itcan’t_______________.mustbedeliciousbeveryinterstingadj.

困倦的；瞌睡的Lookatthispictureofaroom.Howmuchcanyoutellaboutthepersonwholiveshere?Isitaboyoragirl?Whatarehis/herhobbies?Discussyourideaswithapartner.A:Itcouldbeagirl’sroombecauseit’s

verytidy.B:Iguessso.Butitmightbeaboy’sroombecausetheclotheslooklikeboys’clothes.4cIcanseeagirlinthepicture.Ithinkitmustbeagirl’sroom.Iguessnot.Butitmightbeaboy’sroombecauseingeneralboys

likeCD

more

than

girl.Itcould/might/can’tbe...because...Iguessso/Idon’tthinkso.Butitmight/could/mustbe...because…Askandanswerinpairs.情態動詞可以對現在/正在/過去的事情進行推測

現在/將來：

一定/可能/不可能…

正在：

一定/可能/不可能正在做…

過去的：

一定/可能/不可能做了…這本書一定是吉姆的，因為上面有他的名字。ThisbookmustbeJim'sbecausehisnameisonit.我的媽媽可能正在廚房做飯。Mymothermightbecookinginthekitchen.地面是濕的。昨晚一定下雨了。Thegroundiswet.Itmusthaverainedlastnight.情態動詞+do情態動詞+bedoing情態動詞+havedone表推測的時態Task2情態動詞不表推測的用法（一）can1.表示能力

(=am/is/areableto)

eg.HecanspeakbothEnglishandFrench.

=HeisabletospeakbothEnglishandFrench.他能講英語和法語。2.表示允許（同may）回答用can/can’t/Certainly/Ofcourse/Certainlynot/Ofcoursenoteg.Can

Iuseyoureraser？我可以用一下你的橡皮擦嗎？Yes/Ofcourse,youcan.Guide幾個常見情態動詞的用法10'3.表示可能性

1)Canyougowithus?你能跟我們一起走嗎?2)Woodcanbemadeintopaper.木材可以造紙。注：表示能力時，cando=beabletodo，

can

只有過去式，beableto可以有各種時態，指將來具備的能力和過去已實現的能力須用beableto。1)Thebabywillbeabletospeakinsixmonths.2)Whenthefirehappened,hisfriendwasabletoescape.sleepy形容詞，意為“困倦的；瞌睡的”可用作表語或定語。sleepysleepasleep形容詞，意為“瞌睡的；困倦的”既可以是動詞也可以是名詞，意為“睡覺；睡眠”。sleeping作形容詞,意為“供睡覺用的”,一般作定語;也可以是動詞的-ing形式形容詞，意為“睡著的,在睡覺的”beasleep意為“睡著的”；fallasleep意為“入睡”。1.Ididn’thaveagood______lastnight,soIwasso______allday.2.Somestudentsfall______inclassonMondaybecausetheyplaywiththesmartphonestillmidnightonweekends.3.Ifyouneedaplacetostayforthenight,youcansleeponthefloorinoursittingroom,butbringa__________bagplease!

用sleep,sleepy,asleep或sleeping填空sleepsleepyasleepsleepingSummarizethegrammarrules.Summary注意語氣和時態本課句型Summary情態動詞表推測否定句疑問句肯定句結構：對現在對正在進行對過去時態：can不肯，may不問，must肯定不否問情態動詞+動原情態動詞+be+doing情態動詞+havedoneFillintheblankswithmust,might,orcan't.1.Thatbrightlight______beaUFO-there’snosuchthing!2.I’mstillwaitingforthebus,soI______beabitlatefortheparty.3.Thatsweater_____beCarla’s.She’stheonlyonewhowearssuchcolorfulclothes.4.Tony______wanttogototheconcert.Helikesmusic,butI’mnotsureifhelikesrockmusic.5.Thepersonyousawatthesupermarket_____beSusan.Ijusttalkedtoheronthephoneandshe’satworkrightnow.can’tmightSelfCheckmustmightcan’tChoosethebestanswer.4.—WhoseT-shirtisthis?

—It___beJohn's.It’s___

smallforhim.A.can't;muchtooB.can't;toomuchC.mustn't;muchtooD.mustn't;toomuch5.—Whereareyougoingthismonth?—We__