1、come back

回忆起;回想起来

He was also an MP — I'll think of his name in a moment when it comes back to me.

他当时也是一位国会议员，他的名字我得想一下才能记起来。

When I thought about it, it all came back.

当我回想起来，往事全都涌上了心头。

重新流行;再度时兴

I'm glad hats are coming back.

我很高兴又开始流行戴帽子了。

2、happen

（偶然）发生，出现

We cannot say for sure what will happen.

我们无法确定会发生什么事。

The accident happened close to Martha's Vineyard.

事故发生在玛莎葡萄园附近。

（作为结果）发生，产生

She wondered what would happen if her parents found her.

她不知道如果父母找到自己会有什么结果。

He trotted to the truck and switched on the ignition. Nothing happened.

他匆匆走向卡车并转动点火开关，结果没有任何反应。

（尤指不愉快的事）发生（在…身上）;(某人)遭到;遇到

If we had been spotted at that point, I don't know what would have happened to us.

如果当时我们被发现了，我不知道会有什么后果。

It's the best thing that ever happened to me.

这是我所遇到的最好的事情了。