A：Look!There are some students in the playground.
B：Do you see Tim?
A：Oh, yes.
B：Where is he?
A：The boy under the tree is Tim.
B：What is he doing there?
A：He is reading books.
B：Where is Sally? Is she in the playground, too?
A：Yes, she is climbing the tree.
B：Call them back, It's time for class. The teacher is coming.