按要求写句子。
1. He does well in maths.（改为否定句）
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2. Mike is shorter than me. （改为同义句）
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3. — ____ ________________________（根据答句提问题）
— I play the piano.
4. This computer is my father's. （对画线部分提问）
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5. There are some old men in the classroom.（改为单数句）
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6. I go to school by bus every day.（用Mike替换I）
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