happen的用法造几个句子来看看

happen
hap 运气+ -en 使成=make
vi
发生
The accident happened outside my house.
这个事故发生在我家房子的外面.
（与to连用）碰巧
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
（与to连用）偶然发生；巧遇
I happened to be out when he called.
他来访时,恰巧我出去了.
（与on,upon连用）巧遇；偶然发现
I happened on just the thing I had been looking for.
我偶然发现了我所要找的东西.
happen to
发生（某事件）；对…产生影响
A bad accident happened to that family.
那个家庭发生了不幸的事情.

It happened to meet you.碰巧遇见你。
What had it happened?发生了什么事？

When that happens,I won't go back to that store again.