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1、情态动词陈小胖的包包情态动词：must必须can(could)可以，能够may(might)可能need需要will(would)愿意shall(should)应该特征：不能单独做谓语后面接动词的原型没有人称和复数的变化must的用法（1）表示必须，应该，强调的是主观看法Imustcleanmyroom,becauseit'stoodirty.*have（has）to同样表示必须，强调的是客观需要不得不Ihavetocleanmyroom,becausemymotheraskedme.*以must开头的一般疑问句，肯定用must，否定用nee
2、dn't，意为“不必要”Eg：--MustIcleanthestudynow,mom?---______A.No,youmustn'tB.No,youneedn'tC.No,youshouldn't（2）表示“一定”时用于肯定句，否定时用can't--Look!Themanatthegate___beourheadmaster.Heisalwaysstandingthereeverymorning--No,it___behim.Heisholdingameetingintheofficenow.A.must,can'tB.must,mustn
3、'tC.can't,can'tD.can't,mustn't（3）在否定句中，mustn't表示“禁止”，“不允许”--IwanttoknowifI___smokehere--No,you____.Couldyouseethesign"NOSMOKING"here?A.can,needn'tB.mustn't,can'tC.shall,won'tD.can,mustn'tcan的用法（1）强调会某项技能，只有一般现在时和过去时Icouldn'tplaybasketballlastyear,butIcannow.*beableto，强调有能力，
4、可用于不同的时态IwasabletoswimwhenIwas7.TheywillbeabletogotoUS,iftheygettheirvisa.（2）表示请求和允许，“可以”，如果用could的话，表示委婉，客气的语气Canyoupassmethebook?Couldyoupassmethebook?Allofyoucanleavenow.Allofyoucouldleavenow.may的用法（1）may表示可以，用于主语为第一人称的一般疑问句时，其否定回答can't,意为“不可以”,maynot意为“可能不”--MayItakemyp
5、etdogwithmeintothecinema?--Therulesaysno.Soyou____A.can'tB.mustn'tC.mayD.needn't（2）表示推测“可能"，might的语气更不确定，可能性更小Itmayraintomorrow.--Howisyourfriendcoming?--Iamnotsure.He____drivehere.A.mayB.canC.mustD.willneed的用法*need开头的疑问句，肯定回答用must，否定回答用needn't--NeedIprintitoutnow?--Yes,you
6、mustwill（would）的用法*表示意愿，will表示现在，would表示过去IwilltakeitHewouldn'tcomeyesterday*表示征求意见和提出请求Willyoupassmethepaper?Wouldyoupleasepickmeupatfour?shall和should的用法*shall和should用于第一人称时，表示征求意见，询问ShallIopenthewindow?Shallweleavenow?*should用于第二，第三人称时表示义务“应该”Youshouldfollowthelaws.1.Ther
7、earenocustomersinthehotel.It___havethefriendliestservice.A.can'tB.mustC.mayD.needn't2.Necessaryactions___sothatstudentscanbesafeatschools.A.canbetakenB.mustbetakenC.maybetakenD.mightbetaken3.You_____doitifyoudon'twantto.A.needn'tB.mustn'tC.can'tD.couldn't4.Iwillgiveawaymycl
8、othestocharitybecausesomepeople____them.A.mayhaveB.mightneedC.mustuseD.couldbuy5.-
