一般现在时用动词原形或第三人称单数形式.标志词有：every day,evry Sunday,often,always,usually,sometimes ,on Sundays,on weekdays等等.
现在进行时am/is /are+v-ing形式.标志词：now,at the moment Look!,Listen!
一般过去时用动词的过去式.标志词有：yesterday,last week ,last month,last year,two years ago.
一般将来时用will +v(原形）.标志词：tomorrow,in the future,next week ,next Sunday.
过去进行时：was/were+doing 标志词：at that moment,at this time of yesterday,at eight last night.
过去将来时：would +do 没有什么标志词,通常用在从句里.
现在完成时：have/has+动词的过分词.标志词：ever,never,since,already,yet,before.twice,once ,three times.
过去完成时：had+动词的过去分词.此时态是发生在过去的过去,就是在过去之前发生的事.通常用在从句里.有时也有标志词：by the year 2000.