句型转换。
1. There are fifty students in the classroom.（对画线部分提问）
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2. I like the red and green sweater. （改为否定句）
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3. Tim's shirt is under the chair.（对画线部分提问）
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4. There is some milk in the glass.（改为一般疑问句）
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5. This bag is heavier than that bag.（改为同义句）
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6. They are working very hard.（改为感叹句）
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