4. He is singing in the room. (改为否定句) 

He        in the room.

3. Are you waiting for the bus?(作否定回答) 

No,we       .

2. She is writing a letter. (对画线部分提问)

       is she      ？ 

1. He is doing some housework. (改为一般疑问句) 

      he doing       housework?

5. Please be quiet. Your father       (sleep) .

4. Listen!Who       (cry) in the next room?

3. Cindy is       (read) a book in her room.

2. Is your sister        (do) her homework?

1. Look!Some boys are       (swim) in the pool.

(   ) 5. Jodie and her sister       now.

   A. is sing   B. are sing   C. is singing   D. are singing