句型转换。
1. Tom has some new flags in his bag. (否定句)
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2. The socks are five dollars. (对划线部分提问)
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3. He can write them a letter. (一般疑问句)
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4. Let's play with the dog together. (否定句)
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1. Tom doesn't have any new flags in his bag.
2. How much are the socks?
3. Can he write them a letter?
4. Let's not play with the dog together.