You look so tired, what have you been doing?与you look so tir

You look so tired, what have you been doing?与you look so tired,what have you done?的差异
You look so tired, what have you been doing?
you look so tired,what have you done?
请问这两句有什么不同?它们分别是什么时态?他们对应的中文翻译是什么?
谢谢!