【正文】
They are … Is this a schoolbag? Yes, it is. No, it isn’t. schoolbag Is this a ruler? Yes, it is. No, it isn’t. pencil case Yes, it is. No, it isn’t. S1: Is this a _______? S2: Yes,_____. / No, ______. ruler rubber chair Are these pencils? Yes, they are. No, they aren’t. pencils Are these books?