句型转换。
1. We must read the rules. (改为否定句)
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2. He feels dizzy! (就画线部分提问)
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3. There isn't a problem, ______________? (完成反意疑问句)
4. Can you go roller-skating? (作肯定回答)
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5. I think tomorrow is fine. (改为否定句)
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