初中英語語法大全：since的四種用法

　　初中英語語法大全：since的四種用法

　　　 1) since +過去一個時間點　(如具體的年、月、日期、鐘點、1980, last month, half past six)。

　　　 I have been here since 1989.

　　　 2) since +一段時間+ ago

　　　 I have been here since five months ago.

　　　 3) since +從句　

　　　 Great changes have taken place since you left.

　　　 Considerable time has elapsed since we have been here.

　　　 4) It is +一段時間+ since從句

　　　 It is two years since I became a postgraduate student. 

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