i'm playing football (in the playground) tom is

问题描述:

i'm playing football (in the playground) tom is
i'm playing football (in the playground)
tom is (reading books )in his study
对括号提问.

What are you doing?
What is Tom doing?they are doing housework

the students are cleaning the classroom
改为一般疑问句。第一句改为否定句。1,在are后面加not.
2,把are提前