since的用法

线话英语|2011-11-07 17:49:48

之前已讲过since和for的区别了，今天我们来重点了解一下since的用法及它相应的构成。

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.

自1989年至今，我都住在这。
　
　 2) since +一段时间+ ago
　 I have been here since five months ago.

我住在这五个月了。

　 3) since +从句　
　 Great changes have taken place since you left.

自你离开之后这里发生了重大的变化。
　

　 4) It is +一段时间+ since从句
　 It is two years since I became a postgraduate student.

两年前我成为了一名研究生。

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