1. she, the window, open, now. (用现在进行时连词成句)
    ____________________________________________________
2. is, who, the window, cleaning? (连词成句)
    ____________________________________________________
3. She is closing the door now. (改成否定句)
    ____________________________________________________
4. You are doing your homework. (用"I"作主语改写句子)
    ____________________________________________________
5. they, the tree, sing, now, under. (用现在进行时连词成句)
    ____________________________________________________

The boy is playing basketball.    
1. 否定句：_______________________    
2. 一般疑问句：________________________    
   1) 肯定回答：_______________________    
   2) 否定回答：_______________________
3. 对 "The boy" 提问: ______________________

1. They are cleaning the window. (改为一般疑问句)
    _____________________________________________?
2. Tom is working. (改为一般疑问句)
    _____________________________________________?
3. Jim is singing. (改为否定句)
    _____________________________________________
4. Kate is dancing. (对画线部分提问)
    _____________________________________________?
5. She is sitting near the window. (对画线部分提问)
    _____________________________________________?