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大家好,乐天来为大家解答以下的问题，关于since的用法时态现在完成进行时，since的用法这个很多人还不知道,现在让我们一起来看看吧！

1、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)。

2、 　 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.。

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