【摘要】：2013六级考试进入了最后的冲刺阶段，以下是精品学习网特为考生们整理了2013英语六级语法since的用法总结。预祝考生们通过考试!
1) since +过去一个时间点 (如具体的年、月、日期、钟点、1980, last month, half past six)。
I have been here since 1989.
2) since +一段时间+ ago
I have been here since five months ago.
3) since +从句
Great changes have taken place since you left.
Considerable time has elapsed since we have been here.
4) It is +一段时间+ since从句
It is two years since I became a postgraduate student.