1、考點(diǎn)二：情態(tài)動(dòng)詞can的用法，表示某人能做某事。肯定句：主語+can+動(dòng)詞原形+其他Icanplaythepiano.否定句：主語+can+not（can't）+詞原形+其他Icannot（canplaty）thepiano.一般疑問句：Can+主語+動(dòng)詞原形+其他Canyouplaythepiano特殊疑問句：特殊疑問詞+can+主語+動(dòng)詞原形+其他Whatcanyouplaycanplaythepiano情態(tài)動(dòng)詞must,can,could,may,might表推測的用法：情態(tài)動(dòng)詞中的must,can,could,may,might都表推測。其中must的可能性最大，can/cou

2、ld次之，may/might最小。具體用法如下：1.must的用法（1）表示推測“可能性”時(shí)，意思是“一定、準(zhǔn)是”，語氣較肯定，較有把握。HemustbeAmerican.=ItiscertainthatheisAmerican.他準(zhǔn)是個(gè)美國人。 2） must表推測只能用于肯定句。如果要表示“一定不、肯定不”的意思時(shí)，應(yīng)用can't,如詢問某種可能時(shí)，應(yīng)用can。Hemustknowmyaddress.他肯定知道我的地址。（一定）Hecan'tknowmyaddress.他肯定不知道我的地址。（一定不）Canheknowmyaddress他知道我的地址嗎（詢問可能性） 3）

3、3）must表示推測時(shí)，可以推測現(xiàn)在/正在發(fā)生的動(dòng)作/過去發(fā)生的動(dòng)作。Hemusthaveacarnow.（現(xiàn)在）他一定有輛小汽車。Hemustbedoinghisexercisesintheclassroom.（正在進(jìn)行）他一定在教室里做練習(xí)。Hemusthavefinishedthework.（過去發(fā)生）他一定已完成了工作。注：must表示推測時(shí)很少用于將來的情況。一般不用Hemustcometomorrow.可用It'scertain/I'msurethathewillcometomorrow.（4）在反意疑問句中，當(dāng)附屬部分含有表示推測意義的must時(shí)，疑問部分的助動(dòng)詞

4、應(yīng)與must后面的動(dòng)詞在非推測情況下的用法保持一致。Hemustbeaworker,isn'the（現(xiàn)在）他準(zhǔn)時(shí)個(gè)工人，是嗎Itmusthaverainedlastnight,didn'tit（過去）昨晚一定下雨了，是不是YoumusthavelearnedEnglishformanyyears,haven'tyou（完成時(shí)）你定學(xué)了好多年英語,是嗎2. can/could的用法（1）can表示推測“可能性”時(shí)，往往用于否定句或疑問句。Can't“一定不”，語氣很肯定。can在疑問句中意思是“會(huì)、可能”。Hecan'tbeathome.=Itisimpo

5、ssiblethatheisathome.他一定不在家。（ 2）can/can't后可接進(jìn)行時(shí)/完成時(shí)，表示對(duì)現(xiàn)在發(fā)生的動(dòng)作或過去發(fā)生的動(dòng)作進(jìn)行推測。Theycan'tbereadinginthelibrary.他們一定不在圖書館讀書。Hecan'thavegonetoShanghaiforIsawhimaminuteago.他不可能去了上海，我剛才還看見他。It'ssolate.Wherecanshehavegone天晚了，她可能去哪兒了呢（ 3）在反意疑問句中，當(dāng)陳述部分含有表示推測意義的can't時(shí)，疑問部分的助動(dòng)詞應(yīng)與can't后面的動(dòng)詞

6、在非推測情況下的用法保持一致.Hecan'tbeateacher,ishe他不是教師，是嗎Shecan'thavefinishedherhomework,hasshe她一定沒有完成家庭作業(yè)，是不是（ 4）could可用于表示某事有可能發(fā)生或可能是事實(shí)。Don'teatit.Itcouldbepoisonous.不要吃它，可能有毒。Theplanecouldbedelayedbyfog.飛機(jī)可能會(huì)因?yàn)殪F晚點(diǎn)。（ 5）could還可以用于表示客氣、委婉、禮貌的請(qǐng)求語氣。Excuseme,couldyoutellmethewaytothebusstationCouldyouh

7、elpme（ 6）couldn't表示否定推測，表示某事不可能真實(shí)，或由于特定事實(shí)或環(huán)境某事肯定不會(huì)發(fā)生。Itcouldn'tpossiblybepoison.這不可能是毒藥。注：有時(shí)與形容詞的比較級(jí)連用強(qiáng)調(diào)某人或某物不可能再更多地具有某種屬性。Youcouldn'tbemorewrong.你真是大錯(cuò)特錯(cuò)。Icouldn'tbehappier.我簡直是幸福極了。3. may和might的用法（ 1） may,might表示推測“可能性”時(shí)，意思是“可能”、“也許”，語氣沒有must肯定。Hemay/mightbeAmerican.=Itispossibletha

8、theisAmerican.他可能是個(gè)美國人。注：might不表示過去時(shí)態(tài)，只是語氣上比may更委婉，表示的可能性更小。（2）may,might表推測時(shí)，可以用于否定句，意思是“可能不、也許不”，但不用于疑問句。Hemay/mightnotbeathome.他也許不在家。（ 3） may,might可以推測現(xiàn)在正在發(fā)生的動(dòng)作或過去發(fā)生的動(dòng)作。Hemay/mightbesleepingnow.現(xiàn)在）他可能正在睡覺。Theboymay/mightnotbewatchingTVathome.（現(xiàn)在）這個(gè)男孩可能沒在家看電視Thesestudentsmay/mighthaveseenthefilmbe

9、fore.（過去）這些學(xué)生以前可能看過這部電影。（ 4） may,might還可以推測將來的情況。Ithinkweshouldtakeraincoatwithus,itmayrain.我想我們應(yīng)該帶上雨衣，可能要下雨了。Shemightnotcomethisafternoon.她今天下午可能不來了。Exercises:Completethesentencesusing"must"or"can't".1. Ihavetriedtocallhimattheoffice,butthereisnoreply.Hebeathome.2. Theyhaveb

10、oughtanewcar.Theyhavealotofmoney.3. SheiscarryingaJapanesenewspaper.ShebeChinese.4. Hegoesabroadalot,Hehaveanimportantjob.5. Sheisaprofessorattheuniversity.Shebeveryclever.6. SheisactinginaShakespeareplaytomorrow.Shebeanactress.【隨堂練習(xí)】一.選擇填空1. Ithoughtyoulikesomethingtoread.SoIhavebroughtyousomebook.

11、A.oughtB.mightC.couldD.must2. -ThatmanmustbeSarah'shusband.-No,hebeherhusband.Sheisstillsingle.A.can'tB.mustn'tC.maynotD.oughtto3. Petercomewithustonight,butheisn'tverysure.A.mustB.mayC.canD.will4. -Whatitbe-Itbeamailbox,foritismoving.Itbeacar.A.can;can't;mustB.can;can;mustC.can;

12、mustn't;mustD.must;mustn't;can5. -Look,someoneiscoming.Guess.-Jack.He'salwaysontime.A.whocanitbeB.whohemayC.whohecanbeD.whoitcanbe6. TsawMaryinthelibraryyesterday.-Youher.Sheisstillabroad.A.mustn'tseeB.can'thaveseenC.mustn'thaveseenD.couldn'tsee7. David,youplaywiththevalu

13、ablebottle,youbreakit.A.won't;can'tB.mustn't;mayC.shouldn't;mustD.can't;shouldn't8. SusanrefusestomarryJacknow.Shehermind.A.mustchangeB.shouldhavechangedC.musthavechangedD.wouldhavechanged9. Suecometogetherwithustonight,butsheisn'tverysureyet.A.mustB.mayC.needD.will10. Au

14、ntMargarettherain,otherwiseshewouldhavearrivedherebynow.A.musthavemissedB.shouldhavemissedC.hadmissedD.mightmiss1. WhoisthemanoverthereIsitMr.WuIthim,butIamnotquitesure.A.maybeB.maybeC.isD.mustbe2. Somepeoplefeelsickwhentheyreadabookinacaroronaboat.A.mustB.shouldC.mayD.need3. -MustIgotomedicalschool

15、andbedoctorlikeyou,Dad-No,you,son.You'tormOkseyourowndecision.A.can'tB.mustn'tC.shouldn'tD.don'thaveto考點(diǎn)：考查情態(tài)動(dòng)詞辨析。4. Youbehungryafterthelongwalk.Helpyourselftosomecakes.A.shouldB.mustC.needtoD.oughtto5. CouldyoupleasethepianosoloudlyYourbrotherishavingarestnow.A.nottoplayB.notpla

16、yC.don'tplayD.tonotplay6. ThatpinkT-shirtwithPingAn'spictureonitbelongtoMissMa.Sheadmireshimalot.No,itbehers.Shehatespinkcolour.A.must,can'B.may,can'.tC.can,mustn'D.must,mustn't7. -MustIansweritinEnglish-No,you.YoucanuseChinese.A.shouldn'tB.can'tC.mustn'tD.needn&#

17、39;t8. -wegoswimminginXishuanghuLaketoday-Oh,no.It'scoldtoswimonsuchdays.Iwillcatchacold.A.Will;veryB.Will;tooC.Shall;veryD.Shall;too9. PeoplewhodrinkwinetodriveafterMayDay.'tallow'tallowed'tallowD.mustn'tbeallowed10. Iwasaskedtoattendthemeetingbeforeeight.Oh,you.I'msorryforn

18、ottellingyouthatwehavechangedtheplan.A.mustB.can'tC.mayD.needn't11. Youhaveworkedforalongtime.Youbeverytired.A. mustB. canmustn ' t 12. -Can I ask you a question-No, you. YouA. can ' t, mustn ' t C.can, aren ' t supposed13. What you do if you A. could, are B. would, are 【答案】D

19、tC. couldto ask me questions during examsB. can ' t, aren ' t supposed ,don ' t have in Grade 7 nowC. could, was D. would, wereD.14. ThisCDbelongtoBill.Ithashisnameonit.A.mustn'tB.mightC.can'tD.must【答案】D15. Youdriveyourcarsofast.It'sdangerous.A.wouldn'tB.shouldn'tC.co

20、uldn'tD.mightn't【答案】B16. Shallwemeetatthestationat8a.mInfacttrainuntil10a.m.t;doesn'tleavet;leavest;won'tleavet;willleave【答案】C17. -Mum,IwatchTV-No.Unlessyourhomework.A.could;finishesB.can;willfinishC.may;isfinishedD.can;willbefinished【答案】C18. -Look!Amaniscuttingatreeonthemoon.-Itbetr

21、ue.Theteachersaidthereisnoaironthemoon.A.can'tB.maynotC.shouldn'tD.mustn't【答案】A19. 一youpleaseplaytenniswithmeSorry,I.A.Could;can'B.Could;couldnC.tCan;donD.Can;couldn【答案】A20. -Ibrokethewindow.-Youplayfootballnearthewindow.B.shouldn'tC.hadbetter【答案】B21. 一youswim-Ye§butI'mn

22、otagoodswimmer.A.CanB.MayC.NeedD.Must【答案】A22. IsthewomanoverthereMissWhiteItbeher.She'sgonetoHangzhou.A.mustB.can'tC.needn'tD.may【答案】B23. Canyourfriendsing-.,Ican,hecan,shecan,Ican't【答案】B24. -WhereisKate-sheiscleaningtheclassroom.A.MayB.MaybeC.MaybeD.Can【答案】C【解析】25. Shecometotheparty

23、,butIamnotquitesure.A.wouldB.shouldC.mightD.must【答案】C26. -AreyoucomingtoDavy'sparty,Kate-I'mnotsure,Igotothemoviesinstedi.A.wouldB.shouldC.mightD.must【答案】C27. It'sthelibrary!Soyoumakeanynoisehere.C. needD. mayA.mustn'tB.won't【答案】A【解析】28. Lookatthesign!Itsays“NoSmoking!”Yousmokehe

24、re.It'ousangerA.mustn'tB.oughtnottoC.needn'tD.don'thaveto【答案】A29. -MayIwatchTVnow,Mum-No,you.Youdoyourhomeworkfirst.A.don't;mustB.don't;can'tC:can't,mustD.can't;can【答案】C30. There'ssomeboatthedoor.WhoitbeIsitthepostmanNo,itbehim.It'sjustseveno'clock.It'stooearly.A.may,can'tB.will,won'tC.may,mustn'tD.must,maynot【答案】A31. -yousinganEnglishsong-Yes,Ican.A.CanB.MayC