it happen to sb that 和 sb happen to do sth 表达的意思一样么

问题描述:

it happen to sb that 和 sb happen to do sth 表达的意思一样么
我知道有 sth happen to sb 某人发生某事 .sb happen to do sth .某人碰巧做某事.但 it happne that ...表示是碰巧还是发生呢
做好有例子

when I came in he happened to open the doora tragic traffic accident happened to her huaband.It happen that he had a mobile phone similar to the one I lostit happen that 表示碰巧啊那么 如果把这个改下 sth happen to sb就是说把主语改成从句的话 是不是这样的 it happen to sb that ... 有这样的结构么 ?不知道好像没有吧 我没有见过啊