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2017年12月英语四级语法:since的四种用法

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  我们都知道,在大学英语四级考试中,单独考察英语四级语法的题型很少,但是英语四级语法知识点却贯穿整张试卷,下面是新东方网英语四级频道为大家整理的大学英语四级语法知识,希望可以为大家带来帮助。

  2017年12月大学英语四级语法大全目录

  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.

  2017年12月大学英语四级语法大全目录





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