1. This is my ruler.(改为一般疑问句)
    _____ this _____  ruler?
2. That is an eraser.(对画线部分提问)
    _____ is _____ ?
3. I'm OK. (对画线部分提问)
    _____ _____ you?
4. Is this his English book?(作肯定回答)
    Yes, _____ _____ .
5. It is a pencil. (改为否定句)
    It _____ a pencil.