Agreements and disagreements with remarks.
Agreements and disagreements with remarks are used to express and action that is on the subject.

Structure:
Agreements and disagreements with remarks.
Yes, so of course + affirmative auxiliary
He works too much. Yes he does.
He will be CEO soon. Of course.

Disagreements with negative remarks.
My boss isn't gone. Oh yes, he is
They aren't going on a trip next week. Oh yes, they are.
Work won't get easier. Oh yes it will.

Agreements with negative remarks.
You haven't finished the work. No, I haven't.
They couldn't have understood. No, they could not have.

Disagreements with affirmative remarks.
Mike works too hard. No he doesn't.
They ought to find the situation difficult. No they ought not.

Using but.
You think I am lucky. But I don't. / But don't I? / But might I?