这个口语表达使用很普遍，一般有以下三个意思
What are you up to? 的第一个意思是：你最近在忙啥呢？相当于：What's up?
It's been a while. What are you up to? 好久不见啊，你最近在忙啥呢？ I've been preparing for the performance all around the clock. It'll be held at the weekend. 我整天都在准备表演。表演会在周末举行。 Oh, really! Break a leg! 真的吗？祝你好运哦。
What are you up to? 的第二个意思是：你在做什么？相当于：What are you doing?
Hey, what are you up to? 嗨，你在干什么呀？ I lost my job, so I am trying to find a new one to bring home the bacon. 我丢了工作，所以我正试着找个新工作来养家糊口。 Okay, take your time then. 好的，那你慢慢找吧。
-What are you up to? Are you listening?
你在干什么？你在用心听讲吗？ I'm sorry. I was zoning out. Now I'm all ears. 对不起，我刚刚走神了。现在，我全神贯注了。
What are you up to? 的第三个意思是：你打算干嘛？相当于：What are you going to do?
It's Friday. What are you up to? 今天是周五，你准备干嘛去？ I'm gonna hang out with my best friend. 和我好朋友出去玩。
另外，值得注意的是，语气不同所要表达的意思也不一样哦。What are you up to? 也可以表示：你正在搞什鬼？
