问题
句型转换
按要求改写句子。
1. I think he needs our help.（改为否定句）
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2. You should eat some vegetables. (同上)
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3. You need to see a dentist. (改为一般疑问句)
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4. He stayed in Beijing two weeks ago. (同上)
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答案
1. I don't think he needs our help.
2. You shouldn't eat any vegetables.
3. Do you need to see a dentist?
4. Did he stay in Beijing two weeks ago?
