按要求改写下列句子

1.This is my eraser.  (改成一般疑问句)

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2. Can you write the word "chair"? (作肯定回答)

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3. It’s a pencil case. (对划线部分进行提问)

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4. Tiffs is my table. (变成否定句)

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5. Sit down, please. (同义句转换)

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