Ⅰ1.Ben:Where's my baseball,Mom?
Mom:I don't know.Is it on the sofa?
Ben:No,it isn't.
Mom:Is it in your backpack?
Ben:No,it isn't.
Mom:Is it under the table?
Ben:Oh,yes,that's it.Thank you.
2.Mom:Where are my keys?
Anna:I don't know.Are they on the sofa?
Mom:No,they aren't.
Anna:Are they in your bag?
Mom:No,they aren't.
Anna:Look,Mom!They are in the door.
Ⅱ
(示例）1.In Picture 1 the pencil case is in the backpack,but in Picture 2 it is on the backpack.