Expressions for Agreeing and Disagreeing

Stating an opinion

In my opinion,

As far as I am concerned,

If you ask me…

If you want my honest opinion…

The way I see it….

Expressing agreement

I agree with you 100 percent.

That's exactly how I feel.

No doubt about it.

I was just going to say that.

I couldn’t agree with you more.

Expressing disagreement

I don't think so.

I'm afraid I disagree.

No, I'm not so sure about that.

Interruptions

Can I add something here?

Sorry to interrupt, but...

(after being interrupted) You didn't let me finish.