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)。 例句: I have been here since 1989.
2) since +一段时间+ ago 例句: I have been here since five months ago.
3) since +从句 例句: 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 例句: It is two years since I became a postgraduate student.
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