In my opinion you are mistaken. I can prove it. Write to me in PM.
 

I consider, that you commit an error. Let's discuss. Write to me in PM.

I congratulate, you were visited with an excellent idea
 

Excuse, that I interrupt you, I too would like to express the opinion.

In it something is also idea good, agree with you.
 

I think, that you are not right. I can defend the position. Write to me in PM, we will discuss.