That's a good idea but...
Why don't we...?
This is just what we need.
What an awful / bad idea!
I'm not really sure/ convinced...
What a good idea!
I think we...
Let's...
It might work
That's not a bad idea.
I don't feel like it
That sounds like a good idea.
Why not?
What if we...?
Yes, I'd like to.
Maybe we...
I'd rather not
I don't think this...
Let's try that.
How about...?
