To all teachers who claim to be real teachers but not really acting like real ones:
It's not how much knowledge you can impart to your students.
It's all about helping them build their confidence that they can learn and do anything they want in life.
When they come to you to learn, it's not all about you and how much you know.
It's all about them and their potentials.
So, don't ask if they understand,
but ask: What have you understood?