动词时态专讲一、各种时态的构成时态构成时态构成一般现在时do/doesam/is/are一般过去时didwas/were现在进行时am/is/are+doing过去进行时was/were+doing现在完成时have/has+done过去完成时had+done一般将来时shall/will+doam/is/aregoing+todo过去将来时would+dowas/weregoing+todo二、各种时态的用法♦♦一般现在时：1.表示经常性或习惯性的动作；2、用在客观真理，客观存在，科学事实或格言警句中。常与表示频度的时间状语连用；3.由 when，assoonas，until，before，after 引导的时间状语从句或由if,unless，aslongas，once 引导的条件状语从句中，一般现在时代替一般将来时。时间状语：everyday,everyotherday，sometimes，often，usually，onSunday…1.___________________I(leave)homeforschoolat7(每天早晨).2._____________________Theearth(go)thesun.3、ShanghailiesintheeastofChina.上海中国的东方。4、Myteachertoldusthatlight(travel)fasterthansound.5、Didn'tyoufathertellyouthatthesun(be)muchlargerthanthemoon?6、I'llhelpyouassoonasI(到达)Beijingtomorrow.7、Iwon'tleaveunlessyou(tell)meeverything.跟踪练习：1.Smithdoesnotgofishingonweekdays,?,hedoes.A.doeshe...NoB.doeshe...YesC.doesn'the...NoD.doesn'the...Yes2. Mr.BlackoftenfishingonSundays,he?A.goes.doesn'tB.goes.isn'tC.doesn'tgo.doesD.doesn'tgo.is3. he___himselfthere?No,Idon'tthinkso.A.Do.enjoyB.Does.enjoiesC..Does.enjoy4. ___yourteacher__fromthemveryoften?Certainly.A.Do.hearB.Does.hearC.Do.receiveD.receive5. yourmothersomecleaningonSundaysA.Does.doesB.Do.doesC.Does.doD.Do.do一般过去时：1.表示在确定的过去时间里所发生的动作或存在的状态。时间状语有：yesterday,lastweek,anhourago,theotherday,in1981 等。Whereyoujustnow?刚才你去哪儿了？2. 用于虚拟语气（非真实的过去）。IfI（知道）thetruth,Iwouldtellyounow.IfI（是）abird,Iwouldflyinthesky.3. 辨析 usedto/beusedtoScarfusedawalkaftersupper.斯卡夫过去在晚饭后常常散步。Scarfisusedtoawalkaftersupper.斯卡夫现在习惯于在晚饭后散步。♦♦现在进行时：表示现在（指说话人说话时）正在发生的事情。在句中往往有 now 等时间状语或是像Look!/Listen!等提示词语,有的则是通过上下文暗示某动作正在进行；表示目前一段时间内正在进行的动作,也许此时...
