I.将下列句子变为否定句:
1. I am an English teacher.
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2. He is in Class Five.
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3. They are pigs.
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4. This is a yellow pear.
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5. It's a ship.
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II.将下列句子变为一般疑问句:
1. They are tall.
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2. My mother is fine.
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3. The red clock is on the desk.
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4. I am nine.
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5. My name is Wu Ping.
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