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.
The Child of Krakatau volcano fires ash and lava into the air during an eruption in November 2007.The Anak Krakatau volcano emerged in 1927 from the caldera that was formed after the massive Krakatau eruption of 1883.