I understand how to solve the problem.
I managed to make him understand it.
You will understand it as time passes.
I do not understand.
I have no idea what you mean.
Nobody understood why the elephant suddenly turned on its owner.
It was only much later that I came to understand the importance of child education.
To be surprised, to wonder, is to begin to understand.
Fortunately, everybody understood what this foreigner meant, knew I was only making a fool of myself, and laughed at me.