1、What are you doing?你在干什么？
2、What are you up to?你准备干啥？
3、例句：“你在干嘛呢？现在该知道了吧？”那个少爷不知道什么时候跟来了。What are you doing? Now the know?The young man did not know when to come.
4、乔：你在干嘛？这些练习看来都很艰苦。Joe: What are you doing? Those exercises look hard.