Come about
发生
How did this come about?
这事是怎么发生的?
Come across
走过来
She came across to talk with me.
她走过来与我交谈。
偶然碰到
We came across an old man lying in the road.
我们碰见一位老人躺在路上。
Come after
紧跟
Spring comes after winter.
冬去春来。
Come along
一起来
He came along with us.
他与我们一起来的。