happen有被动语态吗

happen有过去式，是happened。它是不及物动词，没有被动语态。
如：The story happened in 1601.
What happened then？这句话不能说What was happened then？
在这里What 做主语，这是一个主谓结构。
1.发生
The accident happened outside my house.
这个事故发生在我家房子的外面。
2.（与to连用）碰巧,巧遇
I happened to be in the market yesterday when a fire started.
昨天发生火灾时，我正好在市场上。
I happened to see Peter on the way to the bookstore yesterday.
昨天我去书店的路上碰巧遇见了彼得。
3.（与on, upon连用）偶然发现
I happened on an old country hotel during the last summer holidays.
去年暑假期间我偶然发现了一家古老的乡村旅馆。
4.happen to．．．临到某人头上
Did you hear what happened to David last night?
你听说大卫昨天晚上发生什么事了吗?