Sorry

I'm (so / very / terribly) sorry.

Ever so sorry.

How stupid / careless / thoughtless of me

Pardon (me)

That's my fault

Please excuse my (ignorance)

Please don't be mad at me

Please accept our (sincerest) apologies

I'm with you on that one

I couldn't agree more

Yes, absolutely

You've got a point there

I'd go along with that

Hear, hear!

I think so too

I couldn't have put it better myself

Great minds think alike

You took the words right out of my mouth

I reckon you should stop now

Why don't you stop now?

How about stopping now?

If I were you, I'd stop now.

I suggest you stop now

You'd (really) better stop right now

I would strongly advise you to stop

My advice would be to stop now

It might be a good idea to stop

You might try stopping

What are you doing tomorrow

Got any plans for tomorrow?

What's your plan for tomorrow?

Are you doing anything tomorrow?

What's on the cards for tomorrow?

What's happening tomorrow?

How's tomorrow looking?

No comment.

I'm not at liberty to say.