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【题目】They knew how to help her.(改为否定句)

【答案】They didn't know how to help her.
【解析】句意:他们知道怎么帮她。因为句中knew是过去式,变为否定句时,需要加助动词did构成否定,否定词为not, did 和not缩写成didn't。否定句结构是:主语+didn't+动词原形+其他成分。故答案为:They didn't know how to help her.

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