句型转换。
1. This is my father. (改为一般疑问句)
    _____ this _____ father?
2. My basketballs are in the box. (改为否定句)
    My basketballs _____ _____ in the box.
3. Mary's pencil is yellow. (对画线部分提问)
    _____ _____ is Mary's pencil?
4. I have a big sports collection.(改为一般疑问句) 
    _____ you _____ a big sports collection?
5. This is a ruler. (改为复数句)
    _____ are _____ .