1. This is my grandmother. (改否定句) 
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2. His telephone number is 535-2375. (改一般疑问句) 
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3. It's his backpack. (改一般疑问句) 
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4. That's a pencil-case in English. (对画线部分提问) 
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5. That boy's name is Jeff. (对画线部分提问)
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6. These are her brothers. (改否定句) 
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7. Those are my books. (对画线部分提问) 
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8. Is he your friend? (肯定回答) 
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9. Are they your teachers? (否定回答) 
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10. Dave and Anna are my friends. (改一般疑问句)
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