1.一般现在时:sometimes,often,usually,always,regularly,generally,every day,once aweek,at present,nowadays, at the moment.
2.一般过去时:
yesterday,last week,three days ago,in 1980
3.一般将来时:
be going to, be to, be about to
4.过去将来时:
should/would+动词原形(should第一人称would第二三人称)
5.现在进行时:
表示正在进行的词语
6.过去进行时:
at that time,then,this time yesterday(last week),at 10o'clock last night
7.现在完成时:
since,for how long,today,this year(month),lately,recently,so far,up to now,till(until),in the past,during
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