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We can open a door with a key.
But they can't open the door .
Mary
Ann
Tom
John
Why?
Whose key is this?
Whose key is this?
It is …’s...
Found the keys' owner. （找钥匙主人）
Tom's key
John's key
Mary's key
Ann's key
pencil
football
pen
key
eraser
ruler
watch
book
Pairwork
（4人小组对话）
选择一到两种物品练习对话。
A: Whose … is this ？
B：It’s …’s ...
I can choose!
（我会选）