1. Lily and Lucy were out yesterday evening. (变成否定句)
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2. I went to New York City last week. (变成否定句)
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3. It was Sunday yesterday. (变成一般疑问句)
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4. He did his homework an hour ago. (变成一般疑问句)
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5. Mr Green came to China two years ago. (对划线部分提问)
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6. I stayed at home just now. (对划线部分提问)
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7. He is flying to Beijing now. (用last month改写句子)
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