happen是不及物动词， 表示“某地(某时)发生了什么事”，常用“sth.+ happen +地点/时间”这一结构来表达，此时主语应是事情；

表示“某人出了某事(常指不好的事)”，要用“sth.+ happen+to sb.”这一结构来表达；

表示“某人碰巧做某事”，要用sb.+ happen+ to do sth.

扩展资料

happen表示“碰巧或恰巧发生某事”时，还可用“It happens / happened that...”这一结构来表达。

例如：

It happened that Brian and Peter were at home that day.

碰巧那天布莱恩和彼得在家了。

It happened that he had to take part in a meeting that afternoon.

碰巧那天下午他不得不参加一个会议。

例如：

It happened that Brian and Peter were at home that day. = Brian and Peter happened to be at home that day.