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每日语法(5.26):since的四种用法

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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)。


  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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