1 一般进行时 be doing 【now, at this time, days, etc. look . listen 】
2 一般现在时 do does 【always, usually, often, sometimes, every week (day,year, month…), once a week, on Sundays, （星期后+s 表示每个星期几都要干某事）】
3 一般过去式 did 【ago, yesterday, the day before yesterday, last week,last(year, night, month…), in 1989, just now, at the age of 5, one day, long long ago, once upon a time】
4 现在完成时 have has done【yet,already,just,never,ever,so far,by now,since+时间点，for+时间段，recently, lately, in the past few years】
5 过去进行时 was/were+doing 表过去这个时段、时刻正在... 【at this time yesterday, at that time或以when引导的谓语动词是一般过去时的时间状语等。 】
6 一般将来时 will do 【tomorrow, next day(week, month, year…),soon, in a few minutes, by…,the day after tomorrow,】
7 过去将来时 宾语从句或间接引语中 表示过去习惯性的动作 表示过去的愿望、倾向，多用于否定句 【the next day(morning, year…),the following month(week…)】
8 将来完成时 【by the time of;by the end of+时间短语（将来）;by the time+从句（将来） 】
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