按要求写句子。
1．Those are stamps from Canada. (改为否定句)
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2．I go swimming on Sunday. (改为一般疑问句)
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3．Can you tell me more about it?(做否定回答)
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4．Thanksgiving is my favourite festival. (就划线部分提问)
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5．Amy collects stamps.（改为一般疑问句)
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