句式变换。
1.I often buy flowers for my mum on Mother's Day. （对划线部分提问）
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2.We are going to have a picnic.（变否定句）
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3.We are going to climb a hill.（变成一般疑问句）
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4.Do you see a big black dog? （作肯定回答）
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5.I wish for a new dog.（对划线部分提问）
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