1. This is a ruler. (改为一般疑问句)
    ______a ruler?
2. That's a box. (改为一般疑问句并作肯定回答) 
    —______a box?
    —______.
3. Is this his pencil sharpener? (改为陈述句)
    ______ pencil sharpner.
4. Are these his Chinese books? (作否定回答)
    ______________________________.
5. That is an eraser in English. (就画线部分提问)
    ______ in English?
6. do, How, spell, you, it (连词成句)
    ______________________________.