请按要求改写句子。
1. Mary usually plays computer games after dinner. (对画线部分提问)
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2. I often get up at six in the morning. (变成一般疑问句并作否定回答)
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3. They like playing football in the afternoon. (变成否定句)
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4. I have a new green shirt. (变成复数句子)
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