He realized how serious the mistake he had made at that moment.
She wasn’t slow to realize what was going on.
I didn’t realize you had company.
It is sobering to realize that this is not a new problem.
It disturbed her to realize that she was alone.
I felt a fool when I realized my mistake.
Only later did she realize her mistake.
I hope you realize the seriousness of this crime.
I suddenly realized what I had to do.
She was mortified to realize he had heard every word she said.