必胜高考网 > 外语类 > 英语六级 > 语法 >

英语六级语法总复习:since的四种用法

时间: 未知2 语法
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.
50331