He was suddenly certain that either answer would send him straight to hell.

It wasn't over yet, of that he was suddenly certain.

Smart people, she was suddenly certain, were out of town.

He was suddenly certain that he knew who had forged his name.

He had loved those features once, he was suddenly certain.

I was suddenly certain he'd been standing out there for a while.

I look from one to the other, suddenly certain that this is it: I must decide.

She was suddenly certain that she could never do so again.

He was suddenly certain of it and he had to keep from screaming by main force.

He was suddenly certain of nothing, not even his physical existence.