I approve of it
She/He may be right
I hold the same opinion
I share your view
You are wrong!
I have no objection
Rubbish!
Speaking personally...
I think otherwise
I have no doubt that...
I bet that...
She/He is quite right
I don't share his/her/your view
As far as I am concerned...
Not at all!
That's just it!
I guess that...
I don't think so
It is my impression that...
Nonsense!
From my point of view,...
To my mind...