动词的时态:since的四种用法
文章作者 100test 发表时间 2007:12:01 14:45:30
来源 100Test.Com百考试题网
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)。例如:
I have been here since 1989. 1989起,我一直在这儿。
2) since 一段时间 ago.例如:
I have been here since five months ago. 我在这儿,已经有五个月了。
3) since 从句。例如:
Great changes have taken place since you left. 你走后,变化可大了。
Great changes have taken place since we were here. 我们走后,变化可大了。
4) It is 一段时间 since从句。例如:
It is two years since I became a postgraduate student. 我考上研究生有两年了。