since的4种时态用法.doc
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Four short words sum up what has lifted most successful individuals above the crowd: a little bit more.-author-datesince的4种时态用法since的4种时态用法动词的时态:since的四种用法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。-
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