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情态动词（1） 表可能性情态动词：may、might.英语中除了情态动词表可能性，还可以用adj或adv: probably， possible.may (可能): 暗含不确定的意思。might:表可能，但它的含义比 may 更不确定。He may be at home .He might come soon .It will probably be hot and sunny.（2） Must表示主观义务和需要。Mustnt表示禁止 Need也表示需要，但不一定是一种义务，语气没那么强烈。（1）need用作实义动词need to do sth 需要做某事肯定句：He needs to go shopping .他需要去购物。否定句：He doesnt need to go shopping . （实意动词否定都借助助动词do/does）疑问句：Does he need to go shopping? Yes, he does. No, he doesnt.（2）need用作情态动词need do sth 需要做某事肯定句：He need go shopping .他需要去购物。否定句：He neednt go shopping （情态动词否定都直接在后面加not）疑问句：Need he go shopping? Yes, he must No he neednt（3）must“必须，得，要”；肯定：You must go to school on time.你必须按时到校否定：You neednt go to school on time.你不必按时到校。疑问：Must I go to school on time? Yes, you must No, you neednt（4） have to 与must的区别（5） must侧重于说话者的主观看法，认为有必要或有义务have to侧重于客观需要，含有“不得不，被迫”之意。e.g. All passengers must wear seat belts. 所有乘客都要系安全带。 My bike was broken yesterday, so I had to walk to school. 昨天我的自行车坏了，所以我只能走路去学校。（3） 情态动词表示推测的用法:表示肯定推测时，语气由强到弱：Must be Can be Could be May be Might be注意在推测的过程中，如果句子中已经有动词的话，省略be。所有的否定推测均用cant be情态动词练习题( )1.John_cometoseeustonight,butheisntverysureyet.A.mayB.canC.hastoD.must()2.They_dowellintheexam.A.canbeabletoB.beableto C.canableto D.areableto()3.-MayItakethisbookout?-No,you_.A.cantB.maynotC.needntD.arent( )4.You_goandseeadoctoratoncebecauseyouregotafever.A.canB.mustC.dareD.would()5.-CanyouspeakJapanese?-No,I_.A.mustntB.cantC.needntD.maynot()6.-He_beintheclassroom,Ithink.-No,he_beintheclassroom.Isawhimgohomeaminuteago.A.can;maynotB.must;maynotC.may;cantD.may;mustnt( )7.Eventhetopstudentsinourclasscantworkoutthisproblem,soit_beverydifficult.A.mayB.mustC.canD.need( )8.Heisntatschool.Ithinkhe_beill.A.canB.willC.mustD.hasto( )9._Itakethisone?A.MayB.WillC.AreD.Do( )10.Thechildren_playfootballontheroad.A.cantB.canC.mustntD.must( )11.You_belateforschoolagainnexttime.A.mustntB.needntC.donthavetoD.dontneedto( )12.-MustIdomyhomeworkatonce? -No,you_.A.neednt B.mustnt C.cant D.maynot( )13.Hisarmisallright.He_goandseethedoctor.A.hasnotto B.donthaveto C.haventto D.doesnthaveto( )14.Hehadtogiveuptheplan,_he?A.did B.didnt C.does D.doesnt( )15.MustIreturnthehooktomorrowmorning?No,you_.Youcankeepitlonger.A.mustnt B.cant C.neednt D.couldnt( )16.HowlongmayIkeepthebook?You_keepitfortwoweeks.A.may B.must C.will( )17.Susan,wouldyouliketogohikingwithusthisafternoon?Idloveto,butI studyforatest.A.mayB.haveto C.can( )18.-MayIgooutnow,Dad?-No.You_letyourmotherknowfirst.A.can B.may C.need D.must( )19.-CanIskateonthelakenow?-No,you_.Itsdangerous.A.cant B.mustnt C.neednt D.wont( )20. -Peterdoesntmindlendingyouhiscamera.He_.Ivealreadyborrowedone.A.neednt B.cant C.mustnt D.shouldnt( )21.Goodmorning.IvegotanappointmentwithMsKinginheroffice.Morning.You_beMr.Jones.Thisway,please.A.will B.must C.can D,might( )22.-Dad,thebreadisnotenough.Iamstillhungry._Ihavesomethingmore?-Buttheresnothinginthefridgenow.A.Must B.Need C.Will D.Can( )23.Wheresmymusicdisc?Icantseeit!Youdbetter_thedisccarefullyinyourbedroom.A.lookup B.lookthrough C.lookfor( )24.-Dowehavetogotoschoolthisafternoon?-Yes,you_.A.must B.can C.need( )25.Congratulations!YouvegotthefirstprizeintheEnglishContest._itbetrue?Itsunbelievable!A.May B.Should C.Must D.Can( )26.-Maywegohomenow?-No,you_.You_togohomeuntil5oclock.A.mustnt;areallowedB.donthaveto;aresupposedC.neednt;arentallowedD.cant;arentsupposedM101.在美国的的天气怎么样？Whats the weather _ in America?2.多雨的天气 _（rain） weather3.刮风的天气 _ (wind)weather4.你在开玩笑么？ Are you _(joke)?5.零下2度 minus 2 _6.在公园里滑冰 go _(skate) in the park7.拍些秋树的照片 take photos_the autumn trees8.一把雨伞 _ umbrella9.最好夏天去_better_(go) in summer10.泳衣 _ clothes11.一件温暖的毛衣 bring a warm sweater _ you12.与.相比较 _13.不时 from _ to _ 14.与.相似 be _ to 15.在暑假期间 _ the summer holiday16.在周末 _ weekend17.天将要刮风了。 It will _ windy.18.为.支付 pay _ sthM101.Its often _(snow) in January in the north of China.2.The best time _(visit) the city is in spring.3.Dont forget _(say) hello to your teacher.4.It was _(probable) the most popular of her songs.5._ bad weather ! Its raining.6.It often _(rain) here in summer.
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