2016年公共英语等级考试二级pets2语法总结(10)-新东方网

2016年公共英语等级考试二级pets2语法总结(10)

网络2016-01-06 17:08

　　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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