I agree with you.
Oh, absolutely / definitely.
That's how I feel, too.
That,s what I think, too.
I see your point, but
I see what you mean, but
Well, maybe, but
I'm afraid I disagree.
I'm not sure about that.
That's not the way I see it.
You can't be serious.
You must be joking.
A: Have you heard the news about
It's terribla, isn't it ?
B: Yes, I agree with you. I think we should all do something about it.
A: But what?