1. When you're a teenager you've got strong opinions on/about everything.
2. McGuinness was expressing his personal opinion.
3. Her writings influenced public opinion.
4. I think you’re wrong, though you’re certainly entitled to your opinion.
5. What's your opinion about/on the matter?
6. People tend to have strong opinions on capital punishment.
7. He didn't express/give an opinion on the matter.
8. Who, in your opinion, (= who do you think) is the best soccer player in the world today?
9. He's very much of the opinion that alternative medicine is a waste of time.
10. Eventually, the government will have to take notice of public opinion.
11. There is a diverse range of opinion on the issue.
12. There was a difference of opinion as to the desirability of the project.
13. Opinion is divided as to whether the treatment actually works.
14. Both performances were excellent, it's simply a matter of opinion as to whose was better.
15. Her opinion of Adam changed after he was so helpful at the wedding.
16. She has a good/high opinion of his abilities (= thinks he is good).
17. I have a pretty bad/low/poor opinion of my sister's boyfriend (= I do not like or approve of him).
18. He has a very high opinion of himself (= thinks he is very skilled/clever in a way that is annoying).
19. My doctor has referred me to a specialist for a second opinion on the results of my blood test.