初中英语时态的标志词语或词组

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。

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