句型转换： 按括号内的要求改写下列句子。
1. Those shirts are white.(改为单数形式)
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2. His pen is on the desk.(就划线部分提问)
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3. Those black pants are five dollars.(就划线部分提问)
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4. My mother likes French fries.(改为否定句)
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5. Mrs Smith needs a blue sweater. (改为一般疑问句)
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6. I want a yellow sweater.(对划线部分提问)
7. What is the price of your bag? (改为同义句)
8. My sister's skirt is yellow .(划线提问)
9. We sell shoes . The shoes are only ￥35 .( 将两句合并为一个句子)
10. What can I do for you ? ( 改为同义句)
