His father happens to be working in your company.

问题描述:

His father happens to be working in your company.
happen to do 是碰巧...但是为什么这里to 后面用的是be 而不是is啊 his father 是第三人称单数 还有就是为什么用 working

happen to do 或者happen to be doing 或者 happen to be done.
是三种happen参与的谓语动词的结构.分别是“做”(无明显时间),“正在做”,“正在被做”