You know what's gonna happen when I catch up with you?你们最好小心点别让我抓到

catch up with:赶上

She walked too slowly to catch up with us.

她走得太慢，跟不上我们。

I have to work hard to catch up with the other students.

要想赶上其他同学，我得特别努力才行。

常用短语:

catch up on补上

I have to catch up on my work so I can't come out.

我要把工作补上，不能出去了。

catch up in陷入

We were caught up in the excitement of the crowd .

我们受到群情激奋的感染。

It's only a couple of carrots 不过是几根胡萝卜嘛

a couple of:几个

I'll be back in a couple of days.

我过几天就回来。

He patched up a couple of old tires.

他补了几条旧车胎。

What are you talking about?你在说什么啊?

talk about:谈论，谈及；谈到

He went on to talk about the world situation.

他接着又谈了谈世界形势。