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How long have you had that bike over there?
I've had it for three years.
How long has his son owned the train and railway set?
He's owned it since his fourth birthday.
Have you ever played football?
Yes, I did when I was little, but I haven't played for a while now.
含有since和for的现在完成时态
since和for是现在完成时当中常见的标志词。since“自从……”，for“持续了……”。since用来说明动作的开始时间，for用来说明动作延续的时间长度。
since和for是现在完成时的重要标志
考点 1
语法讲解
典例
Something ________ in our hometown since 2014.Now it ________ very modern.
A．is changed; is looked
B．has changed; looks
C．changed; looks
B
【点拨】本题用寻找题眼法。根据since可知第一句用现在完成时；由now可知第二句应用一般现在时。
since和for的用法
考点 2
考向一
since的用法
+ 过去的时间点。如：年、月、日、几点等
eg：since 1990 自从1990年起
since 5 o’clock 自从五点起
+ 时间段+ ago
eg：since 3 months ago 自从三个月以前
+ 一般过去时的从句
eg：since you left home 自从你离开家以后
since