for + 一段时间,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 last night.
昨天晚上我睡了八小时.
He was banished to an uninhabited island for a year.
他被放逐到一个无人居住的荒岛一年.
The shop is closed for a week.
这家商店停止营业一个星期.
We are staying there for a week.
我们将在那里待上一个星期.