一般现在时：every day, every year等
一般过去时：yesterday,last week,in1979等
一般将来时; tomorrow, next week,in the future等
过去进行时：at six yesterday morning,at this time yesterday,等
现在进行时：now
现在完成时; by now, since 1999,for two days, so far 等
还有when while as since after before等引导的时间状语从句
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