1. I'm absolutely sure. 2. I'm positive that... 3. I have no doubt that... 4. I'm a hundred percent certain. 5. I'm convinced that... 6. Chances are that... (= this will probably happen) 7. Odds are that... (= this will probably happen) 8. I seriously doubt it. 9. I don't think so. 10. Probably not. 11. It's not very likely. 12. There's not much chance of that. 13. I'd be very surprised if that happened. 14. I wouldn't bet on it. (= there's a small chance it could happen... but it probably won't happen) 15. That'll never happen.
Some, depending on how old you are and also on how much you were paying attention at the time, may have not known or forgotten that Bret Hitman Hart worked as an actor for multiple television shows and also movies when he was able to take those gigs in the 1990s. Hart is, of course, more known for what he achieved during his active inring career. The Excellence of Execution earned millions of dollars working for both the WWE and WCW, and he will make occasional appearances on WWE television. Hart is no longer able to work matches due to an actual stroke that he suffered back in 2002.