Is this your pencil case?Yes, it is.Is this your ruler?Yes, it is.Is that your ballpen? No, it isn’t. Is this / that your …? Yes, it is. No, it isn’t.What’s that over there?It’s a purse.Whose purse is this?Is it Nancy’s purse? No, it isn’t.Perhaps it’s Yang Ling’sPerhaps: 也许，可能 Where’s Yang Ling?She’s in the classroom.in the classroom: 在教室里
