【知识拓展】since的用法
1 )since介词,副词或连词 自…以来,自…以后;由它引导的时间状语代表一个时间段,主句用现在完成时.
He has lived in Beijing since liberation.自从解放以来他一直住在北京
She has been teaching Einglish since she graduated.她毕业后一直在教英语.
They went to Shanghai two years ago and we have not seen them since.
两年前,他们去了上海,自此我们再也没见过.
2)It is/has been + 一段时间+since从句(从句用过去时).
It was/had been + 一段时间+since从句(从句用过去完成时).
It was three years since he had served in the army. 他入伍3年了.
It is twenty years since he joined the party.他入党20年了
3)since 既然 因为.引出原因状语从句.
Since you have signed an agreement,you can’t out of it now.
既然签了协议,你现在就不能反悔.That pudding was the most delicious dessert we ______.
A.have had B.had never had C.would D.had ever had It’s many years since I saw you last, I __________ you at all.
-----I wouldn’t have, either, if someone __________ you by the name.
A.didn’t recognize; hadn’t called B.didn’t recognize; didn’t call
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