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栏目: 英语知识 已有人学习|编辑:admin; 来源:未知;

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.
  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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