Unit8SectionAGrammarFocus-4c课件人教版九年级英语全册3

GrammarFocus-4cUnit8ItmustbelongtoCarla.Bytheendoftheclass,youwillbeableto:

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

正确使用

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此处could/might/may表示推断，意为“可能”，通常与be连用。Fillintheblankswithmodalverbs.GuessingGameThisfootball_____beLily’s.It______beLiMing’s.can’tmust此处can’t表示推断，意为“不可能”。通常与be连用。(否定推测用can't)I’mLiMing.Ilikeplayingfootball.Itmustbeveryexpensive.Thepeoplewhodoitmustbeveryfit.Thatmightbefun.Itmaybetoochallengingforus.Itcouldbedangerous.Itcan'tbethatdangeroustogoonsafari.Somanypeopledoit.Lookatthesesentences.情态动词表推测Lead-in情态动词must，can，could，may和might均可表示推测，可以对过去、现在或将来的情况作出语气强弱不同的推测。Whosevolleyballisthis?ItmustbeCalar's.Shelovesvolleyball.Whosehairbandisthis?ItcouldbeMei'shairband.OritmightbelongtoLinda.Theybothhavelonghair.Whatdidyouseethatnight?I'mnotsure,butitcan'tbeadog.Itwasbigger.Ithinkitmightbeabearorawolf.GrammarFocus情态动词mustcancouldmaymight情态动词表推测大小can't约100%20%-80%possiblytrue几乎0almostnottrue句式情态动词含义用法肯定句must一定表示有把握的肯定推测。may/might/could也许；可能表示没有把握的肯定推测。否定句can’t/couldn’t不可能表示有把握的否定推测。maynot/mightnot可能不表示不太有把握的肯定推测。疑问句can/could可能表示推测。情态动词表示推测的意义和用法可能性mightmaycouldcanmustcan't0%-100%不可能也许，可能(4个)肯定,一定表示推测的情态动词肯定句：mustmay/might/could一定也许可能表示有把握的肯定推测表示没有把握的肯定推测否定句：can't/couldn't不可能表示有把握的否定推测maynot/mightnot可能不表示不太有把握的否定推测疑问句：can/could可能表示推测Hemustbeveryhappywhenheheardthenews.Hemaybeinhisoffice,butI'mnotsure.Thatmancan'tbeyourteacher.Heismuchtaller.情态动词表推测的用法CouldMissListillbeourmathteacherthisterm？注意：含有must的句子变为否定句时，要用can'tHemustbeathome.他一定在家。→Hecan'tbeathome.他不可能在家。(1)“情态动词+动词原形”，表示对现在的事情的推测。我不知道她在哪儿。她可能在武汉。I

don’t

know

where

she

is.She

may

be

in

Wuhan.(2)“情态动词+be+动词-ing形式”，表示对正在进行

的事情的推测。那个穿着西装的男人也许正跑着去赶公共汽车。The

man

in

a

suit

might

be

running

to

catch

abus.(3)“情态动词+have+动词的过去分词”，表示

对过去或已经完成的事情的推测。地是湿的，一定是下过雨了。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.根据推测词，补充说明理由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.情态动词可以对现在/正在/过去的事情进行推测

现在/将来：

一定/可能/不可能…

正在：

一定/可能/不可能正在做…

过去的：

一定/可能/不可能做了…这本书一定是吉姆的，因为上面有他的名字。ThisbookmustbeJim'sbecausehisnameisonit.我的妈妈可能正在厨房做饭。Mymothermightbecookinginthekitchen.地面是湿的。昨晚一定下雨了。Thegroundiswet.Itmusthaverainedlastnight.情态动词+do情态动词+bedoing情态动词+havedone表推测的时态Task2情态动词不表推测的用法（一）can1.表示能力

(=am/is/areableto)

eg.HecanspeakbothEnglishandFrench.

=HeisabletospeakbothEnglishandFrench.他能讲英语和法语。2.表示允许（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吗？Yes/Ofcourse,youcan.Guide几个常见情态动词的用法10'3.表示可能性

1)Canyougowithus?你能跟我们一起走吗?2)Woodcanbemadeintopaper.木材可以造纸。注：表示能力时，cando=beabletodo，

can

只有过去式，beableto可以有各种时态，指将来具备的能力和过去已实现的能力须用beableto。1)Thebabywillbeabletospeakinsixmonths.2)Whenthefirehappened,hisfriendwasabletoescape.sleepy形容词，意为“困倦的；瞌睡的”可用作表语或定语。sleepysleepasleep形容词，意为“瞌睡的；困倦的”既可以是动词也可以是名词，意为“睡觉；睡眠”。sleeping作形容词,意为“供睡觉用的”,一般作定语;也可以是动词的-ing形式形容词，意为“睡着的,在睡觉的”beasleep意为“睡着的”；fallasleep意为“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注意语气和时态本课句型Summary情态动词表推测否定句疑问句肯定句结构：对现在对正在进行对过去时态：can不肯，may不问，must肯定不否问情态动词+动原情态动词+be+doing情态动词+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__