按要求改写句子。    

1. They aren't pigs. (改为肯定句)

                    ________________________________. 

2. He is short and small. (对画线部分提问)

    ___    _    ____ he _____________?

3. They go to school on foot every day. (改为同义句)

    They         _  ______ school every day.

4. There is some water in the glass. (改为否定句)

    There        __________ water in the glass.

5. You can see that is a pear. (改为否定疑问句)

    ___    _    ___________________ see that is a pear?