1) They either don’t speak English, mumble to themselves in the corner, or sit to the side and let others teach.
2) They assign reading that has nothing to do with the class, and which will not be discussed in any fashion.
3) When you get their exams, you have never seen any of the material before.
4) They start another chapter of stuff while there are 3 minutes of class left.
5) They make 8am classes mandatory.