情态动词新教材课件
日期：2010-10-19 10:03
can/could表示许可IcantakeadayoffwheneverIwantCanTomusethecar?Can指可能性Certainthingsinthehomecanbedangerous，hewasabletoexplainwhathadhappened如果谈论过去某个时间有能力且做到了某事，用was/wereableto而不是couldTomhasstartedanexerciseprogramHewasabletoruntwomilesyesterdaywithoutstopping在否定句中，especiallyifyouhaveyoungchildrenCan&beableto 表示能力Canyoutype?Areyouabletotype?在过去时中的区别Althoughthepilotwasbadlyhurt，could与was/wereableto没有区别Tomcouldn’trun(wasn’tabletorun)fivemilesyesterdayOurbabywillbeabletowalkinafewweeksSincehisaccidenthehasn’tbeenabletoleavethehousecan’t/couldn’t “不可能…”99%sureChild:CanIhavesomesweets?I’mhungryMother:Youcan’t/couldn’tbehungryYou’vejusthaddinnercan/couldhave+-ed 可能发生过…ThemoneyhasdisappearedWhocouldhavetakenit?，
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