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What's he doing?
He's sleeping.
What's he doing?
He's running.
What's he doing?
He's swimming.
What are they doing?
They are .
playing five-stones
What are they doing?
They are playing hide-and-seek.
What are they doing?
They are playing with the train.
What are they doing?
They are playing the piano.
playing后面有表示乐器的单词时，乐器前面要有the
What are they doing?
They are playing ping-pang.
playing
What are they doing?
They are playing hide-and-seek.
What are they doing?
They are playing hide-and-seek.
What are they doing?
They are playing hide-and-seek.
What are they doing?
They are playing hide-and-seek.