按要求写句子。
1. This is a sweater.（改为复数形式）
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2. What colour is the shirt? (用 white回答)
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3. Is your mother's dress red?（作否定回答）
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4. My coat is black.（改为一般疑问句）
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5. His socks are black.（对画线部分提问）
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