句型转换。
1. Marry's mother is a teacher. (改为否定句)
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2. My pen is in the pencil case. (改为一般疑问句)
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3. Her dictionary is red. (对划线部分提问)
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4. Is this Peter's ruler? (作否定回答)
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5. That is her cousin. (改为复数句子)
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