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1、情态动词经典用法1.can/could/beableto⑴.注意表推测的用法。①.Canitbetrue?Yes,itmustbetrue.Yes,itmaybetrue.No,itcan’tbetrue.②.Hecanbereadingnow.Hecan’tbereadingnow.⑵.表示某种情绪。①.Whatcansatisfyher?(表不满)②.Whatelsecanyousay?（表不耐烦）③.HowcanIdosuchathing?(表难办)⑶.can/could+havedone①.Johncan/couldhave
2、beenbadlyhurtintheaccident.②.Hecouldhavewonthegame,buthewassocareless.③.Cantheyhavemissedthetrain?④.Hecan’thaveheardyourvoice.⑤.Theycan’thavebeendiscussingtheproblemtoday.注意与must+havedone的区别。Hemusthavebeenherejustnow,forhisbikewashere.⑷.could表婉转。Couldyougivemesomepaper
3、?⑸.can/could与beableto的区别。⑹.can’t…too(over,enough)的用法。①.Youcan’tbetoocarefulindoingthisexercise.②.Thispointcan’tbeoveremphasized⑺.can’t/couldn’t+比较级的用法。①.Ican’tagreemore.②.Itcouldn’tbebetter.③.Hecouldn’tcaremore.④.Theweathercouldn’tbeworse.2.may/might的用法。⑴.maywell很可能，极有
4、可能。Hemaywellnotwanttogothere-----hehasbeentheremanytimes.⑵.may/mightaswell不妨，最好还是，倒不如…It’sverylate,soyoumay/mightaswellgotobed.⑶.may…but…①.Hemaybelazy,buthecanworkveryhardwhenhelikesthejob.②.Whateverhemaybe,heshouldobeytherules.⑷.表祝愿。①．Mayyoubehappy!②．MayGodblessyou!⑸.
5、may/mightbedoing的用法。Hemaybereadinginthelibrary.⑹.may/might+havedone表推测的用法。9现在：Shemighthavegotupnow.过去：①.Shemayhavesaidso.②.Shemightmissthetrain.将来：Hemayhaveleftwhenyougetthere.⑺.might+havedone表应该做而没有做。Hemighthavegotintotrouble,butTomhelpedme.⑻.Iwish….,mayI?⒊must与haveto
6、的用法。⑴.表“偏偏，偏要”指不愉快。①.Mustyoutroublehim,justwhenheisdoinghiswork?②.It’smidnight,Tom,mustyouplaythepianonow?⑵.表推测，肯定用must,否定用can’t/couldn’t。①.Hemustbeagoodstudentwhenhewasatschool.②.Hemustbedoinghishomeworknow.③.Hemusthavefinishedhishomework.④.Hecan’tbedoinghishomework.⑤
7、.Hecan’t/couldn’thavefinishedhishomework.⑶．haveto表义务和习惯。①.Wehavetocarefortheyoung.②.Shehastobeattheofficebefore8o’clock.⑷.haveto/hasto=have/hasgottodon’t/doesn’t/didn’thaveto⑸.haven’tgotto=don’thaveto可表现在或将来。①.don’thavetogonow.③.haven’tgottonow.⑹.must的疑问句的回答。----MustIl
8、eavenow?----Yes,youmust.----No,youneedn’t./youdon’thaveto./youhadbetternot.⑺.must的三种不同否定形式。(can’t,needn’t,mustn’t)①.H
