一般现在时标志词：
every day, evry Sunday, often, always, usually, sometimes , on Sundays,
on weekdays等等。

一般过去时标志词：
ago, yesterday, the day before yesterday, last week/year/night/month..., in 1989,
just now, at the age of , one day, ago, long ago, once upon a time,（从前，很久
以前）then(那时), on that day（在那天）,
一般将来时标志词：
soon, tomorrow, the day after tomorrow（后天），this evening/afternoon/year
before long(不久以后），next year/month/week/summer，in the future, some day(将来的
某一天) ，in two weeks/days/years
现在进行时标志词：
now. Look. Listen. these days ，at that time. at that moment. this time ，yesterday evening
过去进行时标志词：
at that time. at that moment. this time yesterday evening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, on several occasion, in the past few days/weeks/months/years, (up to)these few
days/weeks/months/years, this morning/week/month/year, just, up to present, so far, up to now, till now, since+时间
过去完成时标志词：
by, by the time (of), by the end of + 过去时间； when. before. after…….+过去时间； up till then (直到时); up until last night(直
到昨晚）等； already, just, ever, yet 等。

过去将来时标志词:
the following month (week…), the next time/ Friday/ term/ month。