多用于完成时态 I have not heard from him for a long time.也见用于其它时态：Edison was a leading inventor of the world for 60 years.通常与现在完成时连用,但是有时也可以与一般过去时,一般现在时,一般将来时或者现在完成进行时连用.比如：I slept for eight hours