This Week's Language Function: Agreement

Agreement:

I (entirely) agree with what you are saying.
You're right.
Of course!
Sure!
Fine!
I think that's a good idea!
I must admit that's a good idea!

Typical error:  I'm agree with you

Disagreement:

No way!
You must be joking!
I'm sorry but I don't agree with you.
I'm sorry but I think you're wrong.
I disagree with you.
I'm afraid I see things differently.
Hmm. I'm not so sure.
I'm not very keen on that idea.