Asking for Opinions
What do you think?
What's your opinion?
What are your ideas?
Do you have any thoughts on that?
How do you feel about that?
Giving Opinions
I think we should get a new car.
I don't think we need one.
I believe (that) smoking should be outlawed.
I don't believe (that) it should be illegal.
In my opinion, Gone with the Breeze is the best movie ever made.
I feel that it's the right thing to do.
I don't feel that it's such a good idea.