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) sinc...
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...
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