Listen to these sentences at the Talking People Podcast: Useful Language. Communicative Strategies 2
I entirely agree
I absolutely agree (on that)
You’re absolutely right
I think you're right
I think that's a really good point
That’s a good point
That makes sense
Yes, that sounds sensible
I really liked what you said about…
I'd definitely agree on that (notice "would")
I suppose your right!
I wouldn't argue with you on that! :)
That's precisely my point
That's exactly my point!
I don't quite agree with you on that
I don't quite agree on what you said about...
I don't quite agree on the part about...
Sharing Similar Experiences
Yes, that happened to me too.
Can we agree on that?
Check out also "Defending a Position", "Asking for Clarification and More Info", and "Disagreeing"
Please, for "defending positions" and "attacking positions", read my notes on Discussions in the TP Speaking section - Discussions
More: Agreeing and challenging opinions (read from Natural English)