since可以用于一般过去时吗
问题描述：
since可以用于一般过去时吗
答
since 有两个意思,1、解释为：自从.（到此刻）时,since引导的句子时态是一般过去时态,主句是现在完成时态,如：He has been a teacher since it was three years agoHe has been a teacher 主句,完成时态,since it wa...