don’t.
Do they like popcorn? – Yes, they do. / No, they don’t.
Do we speak English? – Yes, we do. / No, we don’t.
Do I help my mum? – Yes, I do. / No, I don’t.
Does he do to school? – Yes, he does./No, he doesn’t.
Does she like chips? – Yes, she does. / No, she doesn’t.
Does it drink milk? – Yes, it does. / No, it doesn’t.