Whether you're working towards a degree or working professionally, odds are you need to pull the occasional all nighter. We feel your pain, as do about half the taxi drivers in Beijing.

In this lesson, we cover a casual way of asking after someone. How are you feeling? And the best thing about this phrase is that with a slight change it doubles as a useful way of telling others you're not at the top of your game. This is the kind of authentic Chinese that will help you break the ice with strangers. We highly recommend it.