after和since的区别

题目

after和since的区别
我再完型里总喜欢选错
应为带中文意思进去翻译好像都讲得通

答案

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 Pari...