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we need more tents to protect the people in Wenchuan改为被动语态

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we need more tents to protect the people in Wenchuan改为被动语态
we need more tents to protect the people in Wenchuan改为被动语态
More tents are needed to protect the people in Wenchuan.
再问: he book was written by her in1990改为主动语态
再答: She wrote the book in 1990. 她1990年写的这本书. 应该是the book,你少打了一个t
再问: 为什么
再答: 因为原句是过去式,有明显的过去时间状语,in 1990,所以变成主动语态时也要用过去式,write的过去式是wrote,把原句的her变成主语She,改成主动语态就可以了。