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）
_____________________________________1. How many students are there in the classroom?
2. I don't like the red and green sweater.
3. Where is Tim's shirt?
4. Is there any milk in the glass?
5. That bag is lighter than this bag.
6. How hard they are working!