1. Who is sleeping? (she) She is. 2. Who is laughing? (they) They are. 3. Who is going to school? (we) We are. 4. Who is singing a song? (the children) They are. 5. Who is eating fish? (my pet) It is. 6. Who is having fun? (we) We are. 7. Who is swimming? (he) He is. 8. Who is drinking milk? (I) I am.