Kangaroos are good at ....
jumping
He is ..... gymnastic.
doing
Cheetahs are good at ....
running
What are they doing?
They're playing volleyball.
What are they doing?
They're playing tennis.
He's .... a ball.
bouncing
What are they doing?
They're running.
They ..... playing ping-pong.
aren't
Penguins are good at ....
swimming
They ..... swimming.
are
He is ...... a ball.
catching
They .... playing basketball.
aren't