for 后面跟的是一段时间,比如说：三天,四个月,几十年.
since后面跟时间的一点,比如说：去年,上个月等
for three days/one day
since yesterday
for和since在现在完成时的不同,那个a day ,year这些为何是since,last year怎么也是,复数d
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