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【题目】句型转换
(1)She played baseball yesterday .(变成否定句)
(2)He bought an interesting book .(变成一般疑问句,并做肯定回答)

【答案】
(1)

She didn't play baseball yesterday.


(2)

Did he buy an interesting book? Yes, he did.


【解析】(1)过去式,需要用didn't来否定。
(2)过去式的一般疑问句用did来引导,动词还原成原形,肯定回答也使用did。

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