将下列句子改成否定句和一般疑问句。
1. Mary is having supper now.
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2. David has many good friends.
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3. Lucy and Kate are in the bedroom.
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4. Sally's parents have a big house.
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5. The boy is very happy today.
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6. They like the park very much.
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7. They work very hard on weekdays..
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8. Jim cleans his room every day
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