All He Does...
A: I don’t like our new manager. All he does is sit in his office all day.
A: Bob is really getting on my nerves!
B: Me too. All he does is complain about his girlfriend.
All you do is study! It’s good, but you should go outside and get some fresh air sometimes! But if you want to keep studying, I suggest listening, especially if you want to be fluent. You can listen here.