将下列句子改为否定句和一般疑问句并作肯定和否定回答。
1. Liu Tao is going to USA next month.
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2. I will try my best to win the match.
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3. There will be a singing contest tomorrow afternoon.
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4. My father is going to buy a bike.
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5. They are going to do some shopping tomorrow morning.
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6. We will meet at six tomorrow evening.
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7. I'll join them.
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8. It is going to snow.
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