Ask and Make Suggestions:
- What do you want to say?
- Why don't we ...?
- What about ...?
- Can we choose this one?
Give Opinions:
- I think ... is a good idea because ...
- I don't think so because ...
- All right, I also prefer this one.
Agree and Disagree:
- All right, let's do that!
- Absolutely!
- Yes, I agree with you.
- I don't agree with you because ...