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11.13 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.

上一条11.12 比较since和for 下一条11.14 延续动词与瞬间动词

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