英语八大时态标志词：
一般进行时 be doing ；
一般现在时 do does ；
一般过去式 did；
现在完成时 have has done；
过去进行时 be doing ；
一般将来时 will do；
过去将时 the next day；
将来完成时 by the time
一、 一般现在时：
标志词：always, usually, often, sometimes, every week (day, year, month…), once a week, on Sundays
例：He always helps others.
他总是帮助别人。
二、 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 5, one day, long long ago, once upon a time
例：I bought some fruits yesterday.
我昨天买了一些水果。
三、 一般将来时：
标志词：tomorrow, next day(week, month, year…),soon, in a few minutes, the day after tomorrow
例：My mother is coming to visit me next week and is staying here until May.
我妈妈下周将来看我，并会呆到5月。
四、 现在进行时：
标志词：now, at this time, these days, at present, at the moment
例：He is listening to the music now.
他现在正在听音乐。
五、 过去进行时：
标志词：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。
例：When he lived in country，he was always helping the poor.
住在乡下时，他总是帮助穷人。
六、 过去完成时
.时间状语：before, by the end of last year(term, month…),etc.
例句：
As soon as we got to the station, the train had left.
By the end of last month. We had reviewed four books
七、将来完成时态
.时间状语：by the time of;by the end of+时间短语（将来）;by the time+从句（将来）
例句:By the time you get back,great changes will have taken place in this area
八、 过去将来时
时间状语：the next day(morning, year…),the following month(week…),etc.
例句：
He said he would go to Beijing the next day.
I asked who was going there .
