1. I'm sure.
2. You're absolutely correct.
3. I'm 100% certain.
4. Right.
5. You got it.
6. I couldn't agree with you more.
7. I have no problem with that.
8. Your answer is to the point.
9. This is just what I have in mind.
10. Your opinion is reasonable.
11. If you say so.
12. You got it.
13. No doubt.
14. You have a point there.
15. I have no doubt about it.
16. Yes, as far as I know.
17. I'm afraid so.
18. It can't be otherwise.
19. That's just what I'm getting at.
20. I believe so.
