AGREE - DISAGREE - DISCUSS

Usefull expressions: 

In my opinion… I totally agree…
I can tell… Speaking of which…
Actually… Really…. That’s not exactly…
I could say I… Obviously, …. I disagree…
As a matter of fact… What’s more….
I can assure you… In the first place…. plus/besides…
In the first place/ in the second place/…. Finally…
I recognize… I have to say… /I must say…
In addition… 
To top it all off…./As if that weren’t enough…