since的时态必定是现在完成时和过去完成时:he has taught english since 2000.
after后面加一段时间,时态是过去(完成)时,将来时:he will go to the underground station after ten o'clock.he went (has gone)to Paris after 2000.
since指的是已经完成了此事
after指的是已经完成了此事或没有完成而将要完成.
after和since的区别.
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