I'm certain of that

Grammar usage guide and real-world examples

"I'm certain of that".

"He could play, I'm certain of that," said the PNGRL president, Garry Juffe.

It will yield eventually to a physical cure, I'm certain of that".

"This picture is not by Leonardo, I'm certain of that," said George Wachter, director of Sotheby's old master paintings department worldwide.

"It will pick up eventually, I'm certain of that, but it's just a question of how long you're willing to wait".

"Arsene will go when he chooses to go, I'm certain of that, then people will get what they want - the headline 'Wenger to go'," Wilson told Radio 5 live.

"I do think that the board will act in the best interests of the school; I am certain of that," she said.

I was certain of that approach until my juniors and seniors expressed their disgust with Donald Trump's 2015 presidential announcement speech.

They had been summoned by the endangered moon: I was certain of that.

I stated and re-stated my belief that England had the abilities to win this World Cup and, when I look at the semi-finalists, I am certain of that.

"You have to want it so badly, you have to want to put yourself through pain, anguish and agony and until I am certain of that I'll be playing my cards very close to my chest".