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11.13 since的四种用法

发布时间:2011-02-20 16:18:24作者:知识屋

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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