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【题目】The girl could dance three years ago. (改为否定句)
The girl three years ago.

【答案】couldn't;dance
【解析】①句意:三年前这个女孩不会跳舞.肯定句改为否定句,先找be动词,再找情态动词,本句中有could,故只要在could后面加not.could not=couldn't.所以答案是couldn't.
②句意:三年前这个女孩不会跳舞.情态动词+动词原形.所以答案是dance.

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