★一般现在时:

　　often,usually,always,sometimes,never,seldom,everyweek/day/year/month...,onceaweek,onSundays

　　★一般过去时：

　　ago,yesterday,thedaybeforeyesterday,lastweek/year/night/month...,in1989,justnow,attheageoffive,oneday,ago,longago,onceuponatime,then(那时),onthatday,

　　★现在进行时：

　　now,atthistime,thesedays,Listen!Look!atthismoment/time

　　★过去进行时：

　　atthistimeyesterday,atthattime或"when+一般过去时从句",at1:00lastnight

　　★现在完成时：

　　recently,recentyears,thesedays/years,lately,since,for+时段,inthepastfewyears,eversince,inthelastfivemonths,uptonow,sincethen,sofar,ever,never,yet,lately,once,twice,three/fourtimes...,already,before,just.

　　★过去完成时：

　　before,bytheendoflastyear/term/month...

　　★一般将来时：

　　tomorrow,nextday/week/month/year...,soon,inafewminutes,by...,thedayaftertomorrow,inthefuture

　　★过去将来时：

　　thenextday/morning/year...,

　　thefollowingmonth/week...