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1、过去现在将来一般didwas/were标志词：1)yesterdaymorning(afternoon,evening)等；2)lastnight/year等；3)时间段+ago；4)介词+一时间名词（例如：onFriday）5)then,justnow,once,以及由after或before构成的介词短语do/doesis/am/are标志词：1)often、usually、always、sometimes、everyday、onceaweek等频度副词，2)onSaturdays、inthemorning(afternoon,evening) 等begoingtodo/wil
2、ldo标志词：tomorrow，nextweek/month/year等进行was/weredoing标志词：1)atthatmoment,atteno’clocklastnight,(at)thistimeoflastyear,2)lastnight,alldayyesterday,thismorning,thewholemorning,fromninetotenlastevening,3)when,whileis/am/aredoing标志词：1)now，atthemoment,thesedays；2)look，listen等此外要看具体语境willbedoing标志词：1)a
3、t10tomorrowmorning等具体将来时间；2)tomorrow，nextweek/month/year等完成haddone标志词：1)by++过去时间：e.g.bythetime…(在…时之前),bytheendof…(在…结束/末之前),bythen(截止到那时);2)upto/till(直到)+过去时间：e.g.uptillthen(直到那时)等3)when,before,after,assoonas,till/until引导的有先后的两个动作4）由told/said/asked等引导的宾语从句中have/hasdone标志词：（已经，最近）already,just,
4、yet,before,recently,still,lately,recently,inthelastfewdays；（次数）ever,never,once，twice,severaltimes,howmanytimes，howlong（今天，这周/年/月）just,today,thismorning/week/month/year,（至今为止）uptonow,bynow，sofarwillhavedone标志词：by+将来时间：bythetimes+sbdo/doessth，…willhavedone；bytheendofnextweek/month/year等
