时间变化:
today-that day
this afternoon-that afternoon yesterday-the day before /the previous day
yesterday morning-the morning before/ the prious morning
now- then here - there
3years ago- 3years before
tomorrow- the next/following day
last week-the week before
next year-the next/following year
the day before yesterday- two days before
the day after tomorrow- in two days' time /two days later /after two days
基本的就这些 没说到的可以采用这些规律自己推出
