高中英语,It happened that I was out wehen he called源自句型“sb.+happ

It happened that I was out when he called。It happens that sb does sth 是一个句型,“碰巧某人做某事。”例如：It happened that I was waiting for a bus at the bus stop then。碰巧那时我在公交站等公共汽车。这个句型可以转化成“sb。+happens+to do sth。”转化的方法是：（1）从句的主语+（2）主句的谓语+（3）从句的谓语转化为非谓语（动词不定式）to do。另外你说的“happened是不及物,不可以用完成时态”是错误的,不及物动词不可以用于被动语态。that引导的是主语从句,It是形式主语。 再问： 转化后是不是 I happened to was out when he called？当他来的时候我碰巧离开？ 再答： 转化后是: I happened to be out when he called？当他来的时候我碰巧离开？