1、表示“某地(某時)發生了什麼事”,常用“sth.+ happen +地點/時間”這一結構來表達,此時主語應是事情.例如：The story happened in 2003.這個故事發生在2003年。
2、表示“某人出了某事(常指不好的事)”,要用“sth.+ happen+to sb.”這一結構來表達.例如：A car accident happened to her this morning.今天上午她發生了交通事故。
3、表示“某人碰巧做某事”,要用“sb.+ happen+ to do sth.”這一結構來表達.例如：I happened to meet a friend of mine in the street yesterday.昨天我碰巧在街上遇到了我的一個朋友。
4、happen表示“碰巧或恰巧發生某事”時,還可用“It happens / happened that...”這一結構來表達.例如：It happened that Brian and Peter were at home that day.碰巧那天布萊恩和彼得在家了。
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