come and go 来来往往

这个短语看似陌生，但其实很有用处。可以用在自由出入或非永久的擦肩而过等情况下。Have come and gone 则是现在完成式的用法。

例句：

This is my home and I want to be able to come and go whenever I want!

这是我家，我想什么时候出入就什么时候出入！

I have stomachaches. They come and go in every few minutes.

我肚子疼，每隔几分钟就会疼一次。

There's no chance my mother's already come and gone.

我妈妈不可能来过又走了。

对话：

A: Has Janet been over to see you today?

加内特今天来看过你吗？

B: No, she comes and goes when she has free time.

没有，她有时间时才会过来。