Sun-hee: Hey, David. How's it going?
David: Fine, thanks. How are you?
Sun-hee: Pretty good. So, are you classes interesting this semester?
David: Yes, they are. I really love chemistry.
Sun-hee: Chemistry? Are you and Beth in the same class?
David: No, we aren't. My class is in the morning. Her class is in the afternoon.
Sun-hee: Listen. I'm on my way to the cafeteria now. Are you free?
David: Let's go.

Yes/No Questions

Are you free?
Yes, I am./No, I'm not.

Is David from Mexico?
Yes, he is.
No, he isn't/No, he's not.

Is Beth's class in the morning?
Yes, it is.
No, It isn't./ No, it's not.

Are you and Beth in the same class?
Yes, we are.
No, we're not./ No, we aren't.

Are your classes interesting?
Yes, they are.
No, they're not./No, they aren't.