What is the apple doing? (write)
It is writing.
What are they doing? (eat)
They are eating.
What is the man doing and what is the boy doing? (teach / study)
The man is teaching and the boy is studying.
What is the bear doing? (wave)
It is waving.
What is the Grinch doing? (drink)
He is drinking.
What is the boy doing? (draw a picture)
He is drawing a picture.
What is she doing? (sit on a chair)
She is sitting on a chair.
What is the girl doing? (sing)
She is singing.
What is the girl doing? (read a book)
She is reading a book.
