What are you doing? (sail)
I'm sailing a submarine.
What are you doing? (drive)
I am driving a lorry.
What is he doing? (sail, speedboat)
He is sailing a speedboat.
Is he riding a bicycle?
Yes, he is.
What is he riding?
He's riding a bike.
Is he flying a plane?
Yes, he is.
What is she doing? (fly)
She is flying an airplane.
Is she sailing a big cruise ship?
No, she isn't
What is she doing? (drive)
She's driving a car.
Is he flying a rocket?
Yes, he is.
What are you doing? (fly, hot air balloon)
I am flying a hot air balloon.
What is he driving?
He's driving a bus.
Is he riding a motorbike?
Yes, he is.
What are you doing? (drive)
I'm driving a lorry.
What are you riding?
I'm riding a motorbike.
What are you doing (drive, van)
I am driving a van.
What are you driving?
I'm driving a lorry.
What is he doing? (sail)
He's sailing a boat.
Arrange: sailing / is / she / boat / ? / a
Is she sailing a boat?
What is he flying?
He's flying a plane.
What are you doing? (fly)
I'm flying a helicopter.
What is she sailing?
She is sailing a boat.
What is she driving?
She is driving a car.
Is he driving a bus?
No, he isn't.
Arrange: am / car / driving / I / a
I am driving a car.
What are you doing? (drive, taxi)
I am driving a taxi.
Is it driving a bus?
No, it isn't.
What are you flying?
I'm flying a helicopter.
What are you riding?
I'm riding a train.
What is she doing? (sail, canoe)
She is sailing a canoe.