happen 不及物动词,因此它不用于被动态. 1.sth happen 发生了sth A serious accident happened yesterday.昨天发生了一起严重的事故 2.sth happen to sb 某人发生了某事 An accident happened to him yesterday.他昨天发生车祸了 3.sb happen to do sth 碰巧做某事 I happened to sit next by him in the cinema.在电影院我碰巧坐在他旁边. 回答完毕.
