第三讲时态语态与主谓一致

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1、第三讲时态、语态与主谓一致昨天我去北京了.下周我要去北京.我已经去过北京3次了.了解谓语动词在不同的时间条件下词尾的变化，是学习时态的关键一一般现在时（1）经常性反复性发生的动作——习惯HegetsuplateonMondays.everyday/week/month/timealwaysusuallyoftenneversometimes(2)在时间和条件状语从句中，当主句用一般将来时的时候，从句用一般现在时代替一般将来时。WhenbeforenotuntilassoonasifincaseunlessaslongasYouwon’tk

2、nowhowdeliciousthefruitisuntilyoutasteit.IwillcallyouwhenIarriveat$2.Ifyoucome,youwillarguewithhim.Ifyoucome,youcanarguewithhim.Ifyoucome,pleaseinformusinadvance.AssoonasIarrivein$2,Iwillwritetoyou.Itwillbeatleastthreemonthsbeforeherecoversandreturnstoworking.Iwillnotseta

3、boutdoingtheexperimentuntilhecomesback.(3)描述自然现象和客观规律时，用一般现在时态。Teacherstoldusthatlighttravelsfasterthansound.二一般过去时(1)表示过去某一点时间内发生的动作或存在的状态。（点时间）IlearnedEnglishin1998.in1998twodaysagolastyear/week/monthjustnowatthatmomentatthetimethenintheolddays(2)表示过去某一段时间内经常性、反复性发生的动作或

4、存在的状态（段时间）Ialwaysgotupatseveno’clockeverydayin1998.lastyear/month/week/nightjustnowatthetimethenatthatmomenttheotherdayintheolddays注：1usedtodo2beusedtodo3beusedtodoinggetusedtodoing三现在完成时1)IhavelearnedEnglishsince2001.IhaveleanedEnglishsincetenyearsago.IhaveleanedEnglishs

5、inceIwastwenty–twoyearsold.IhaveleanedEnglishfor//tenyears.IhaveleanedEnglishsincetenyearsago.教材142页试题Theyhavenotseeneachother/metsincetenyearsago.Ithasbeentenyearssincetheysaweachother.since+始点==段时间起始点===终点in1998-----since1998twodaysago-----sincetwodaysagolastyear/week/m

6、onth-----sincelastyear/week/monththen----sincethenbynowsofaruntilrecentlyinthepasttenyearsIhaveleanedEnglishfortenyears.for+段时间===段时间ItistenyearssinceIleanedEnglish.Ithasbeen/is+段时间since一般过去时的句子Ihavenevermethimbefore.oncetwiceIhavebeento$2once.Ihavebeento$2twice.Theyhaveg

7、oneto$2.Ithasbeentenyearssincetheysaweachother.Ihavebeento$2twice.Hehashelpedmeinthepasttenyears.2.表示过去发生的动作对现在的影响（句尾没有时间状语）Iate.Ihavealreadyeaten.already陈述句（肯定句中）yet疑问句和否定句中Ihavepostedtheletter.注：diedeathdeadHisgrandpahasalreadydied.Hisgrandpa_____fortenyears.Hisgrandpa_

8、_____fortenyears.AhasdiedBhasbeendeadhasdied-----hasbeendeadhasborrowed----haskeptIhavekeptthebo