10 expressions to use in speaking and writing, to tell someone that they are wrong:
1. I'm afraid that's not quite right.
2. Actually, I think you'll find that. . .
3. I'm afraid you're mistaken.
4. I don't think you're right about. . .
5. Actually, I don't think. . .
6. No, you've got it wrong.
7. No, that's all wrong.
8. Rubbish! / You're talking rubbish.
9. Where did you hear that?
10. If you check your facts, you'll find. . .