八大时态标志词
一般现在时标志词：
everyday,evrySunday,often,always,usually,sometimes,onSundays,onweekdays等等。一般过去时标志词：
ago,yesterday,thedaybeforeyesterday,lastweek/year/night/month...,in1989,justnow,attheageof,oneday,ago,longago,onceuponatime,（从前，很久以前）then(那时,onthatday（在那天）,一般将来时标志词：
soon,tomorrow,thedayaftertomorrow（后天），thisevening/afternoon/year
beforelong(不久以后），nextyear/month/week/summer，inthefuture,someday(将来的某一天，intwoweeks/days/years现在进行时标志词：
now.Look.Listen.thesedays，atthattime.atthatmoment.thistime，yesterdayevening过去进行时标志词：
atthattime.atthatmoment.thistimeyesterdayevening等；或者与when,while,as引导的过去时间状语连用。现在完成时标志词：
already（用于肯定句）,yet（用于否定，疑问句）,just,before,recently,still,lately,never,ever,never,twice,onseveraloccasion,inthepastfewdays/weeks/months/years,(uptothesefew
days/weeks/months/years,thismorning/week/month/year,just,uptopresent,sofar,uptonow,tillnow,since+时间
过去完成时标志词：
by,bythetime(of,bytheendof+过去时间；when.before.after…….+过去时间；uptillthen(直到时;upuntillastnight(直到昨晚）等；already,just,ever,yet等。
过去将来时标志词:
thefollowingmonth(week…,thenexttime/Friday/term/month
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