九年级英语单词之since的四种用法

　　　since的四种用法

　　　 1) since +过去的一个时光点　(如具体的年、月、日期、钟点、1980, last month, half past six的九年级英语单词用法)。

　　　 I have been here since 1989. 内容来自

　　　 2) 九年级英语单词since +一段时间+ ago CopyRight .com

　　　 I have been here since five months ago. CopyRight .com

　　　 3) since +从句　

　　　 九年级英语单词例句：Great changes have taken place since you left.

　　　 Considerable time has elapsed since we have been here. 内容来自

　　　 4) It is +一段时间+ since从句 内容来自

　　　 It is two years since I became a postgraduate student. 

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