now（then）；tomorrow（thenext/followingday） 　　today(thatday）；nextweek（thenext/followingweek/month/year） 　　yesterday（thedaybefore）twodaysago（twodaysbefore） 　　lastweek/month/year(theweek/month/yearbefore)thisweek/month/year(thatweek/month/year)