knew about it
Том уже знал об этом.
Tom already knew about it.
Did you know about this in advance?
Жаль, что я не знал об этом в детстве.
I wish I knew about this when I was a kid.
Если бы только я знал об этом раньше!
If only I had known about this earlier!
Did you even know about this?
He already knew about it.