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?

【考点】不定代词,系动词,实义动词,一般疑问句,特殊疑问句

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