I'm sure that he will win.
=I'm certain that he will win.
=I'm sure/certain of his winning.
=It's certain that he will win.
=He is sure/certain to win.
I'm sure that he will win.
=I'm certain that he will win.
=I'm sure/certain of his winning.
=It's certain that he will win.
=He is sure/certain to win.