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一般(do)进行(bedoing)完成(havedone)完成进行(havebeendoing)现在do/doesam/is/aredoinghas/havedonehas/havebeendoingam/is/aredoneam/is/arebeingdonehave/hasbeendonehas/havebeenbeingdoneHecomeseveryday.Heissleeping.Hehasfinishedhishomework.Hehasbeendoinghishomeworkforthreehours.often,always,usually,sometimes,onSunday,every…,atweekends,onceinawhile,threetimesaday(right)now,atthismoment,atpresent,forthetimebeing,thisyear,alwaysfor,since,sofar,in/over/duringthepast/lastfewyears,lately,recently,just,uptonow,uptillnow,untilnow,already,yet,ever,never,twice,threetimes,beforeallthetime,allthismorning,forthreeyears,sincehewasfive,inthepastfewyears过去didwas/weredoinghaddonehadbeendoingwas/weredonewas/werebeingdonehadbeendonehadbeenbeingdoneHecameyesterday.Hewassleepingatthattime.Bytheendoflasttermwehadlearnt20units.Shehadbeensufferingfromabadcoldwhenshetooktheexam.yesterday,last…,thedaybeforeyesterday,…ago,in2000,inthepast,theotherday,justnow,onceuponatime,…at10lastnight,then,thismorning,atthattime/moment,thistimeyesterday,lastyear,alwaysby+过去时间，bythen,bytheendof+过去时间，bythetimeyoudidsth.将来willdowillbedoingwillhavedonewillhavebeendoingwillbedonewillbebeingdonewillhavebeendonewillhavebeenbeingdoneHewillcometomorrow.Hewillbesleepingatthistimetomorrow.Bytheendofthistermwewillhavelearnt20units.Hewillhavebeenworkingherefortwentyyearsbytheendofthisyear.tomorrow,thedayaftertomorrow,in2020,inafewyears,infuture,inthefuture,soon,next…,anotherdayattentomorrow,then,thistimetomorrow,nextyearby+将来时间,bythen,bytheendof+将来时间,bythetimeyoudosth过去将来woulddowouldbedoingwouldhavedonewouldhavebeendoingwouldbedonewouldbebeingdonewouldhavebeendonewouldhavebeenbeingdoneHesaidhewouldcome.Hesaidhewouldbesleepingatthistimetomorrow.Theteachersaidwewouldhavelearnt20unitsbytheendofthisterm.Hesaidhewouldhavebeenworkingherefortwentyyearsbytheendofthisyear.