句型转换。
1. Is this racket yours? (同义句)
Is this _____ ______?
2. There is one ball under the desk. (对划线部分进行提问)
How many _______ ______ there under the desk?
3. Close the window, please. (否定句)
______ _______ close the window.
4. My trousers are black and white. (对划线部分进行提问)
What _______ _______ your trousers?
5. The old man there is a doctor. (对划线部分进行提问)
______ ______ the old man there?