come about和 happen用法的区别

问题描述:

come about和 happen用法的区别

happen作“发生、碰巧”解,常用于偶然或突发性事件,例如:
What happened to you?(一般不说:What did you happen?)
Maybe something unexpected happened.
I happened to see him on my way home.
= It happened that I saw him on my way home.
come about表示“发生、产生”,多指事情已经发生了,但还不知道为什么,常用于疑问句和否定句,例如:
When Mother woke up,she didn’t know what had come about.
I’ll never understand how it came about that you were late three times a week.
Do you know how the air accident came about?