1.I want to buy nine postcards.
否定句：I don't want to buy nine postcards.
一般疑问句：Do you want to buy nine postcards?
特殊疑问句：How many postcards do you want to buy?
2.We write a letter on paper.
否定句：We don't write a letter on paper.
一般疑问句：Do you write a letter on paper?
特殊疑问句：Where do you write a letter on?
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