2019年英语四级12卷1答案,2019年12月英语四级语法用法辨析：since的四种用法

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2019年12月大学英语四级语法用法辨析汇总

　　英语四级语法用法辨析：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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