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2018年6月英语六级语法知识:since的四种用法

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发表于 2018-1-13 13:28:32 | 显示全部楼层 |阅读模式
  英语六级语法知识: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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