In my opinion... In my personal opinion... I personally think... I don't think that... I feel... To my mind... In my view... It seems to me... If you ask me...

Not everybody will agree with me, but... As far as I'm concerned... I can say... I reckon that... I support the view that... From my point of view... I'd like to say that...

Agree I agree to some (certain) extent... Couldn't agree more... That's a great idea... That's very true... I know what you mean... That's right...

Disagree I'm afraid... Don't see it quite like that... Get your point, but... Yoe, but on the other hand... I totally (entirely, absolutely) disagree... It's absolute rubbish... It's complete nonsence... It's unthinkable...