1. Tom wants to have a party because next Saturday is his birthday. (就画线部分提问)      
                               Tom want to have a party?  
2. The little boy is very short. He can't get the book on the shelf. (改为同义句)      
The little boy___         ,                  ,                ,               get the book on the shelf.
3. Be careful，or a car may hit you. (改为同义句)   
       ___         ____       _____ careful, a car may hit you.
4. I don’t think he is right. (改为反意疑问句)      
I don't think he is right,                     _________?
5. He joined the army 2 years ago. (改为同义句)         
He                                       the army for 2 years.