按要求改写下列各句，每空一词。 1. This is a book. (对画线部

问题句型转换

按要求改写下列各句，每空一词。

1. This is a book. (对画线部分提问)
    _____ _____ _____?
2. It is an apple. (改为否定句)
   It ______ _____ an apple.
3. Is it a pen? (改为陈述句)
_____ _____ a pen.
4. That's a box. (改为一般疑问句，并作肯定回答)
   —_____ _____ a box?
   —_____, _____ _____.
5. I can spell that. (改为一般疑问句)
    _____ _____ spell that?