问题描述：
怎么把这个句子改为否定句?
1.Both of her parents are teachers.(改为否定句)
2.He is old enough to go to school.(变为复合句)
3.You look much prettier in the new dress.(变为感叹句)
1.Both of her parents are teachers.(改为否定句)
2.He is old enough to go to school.(变为复合句)
3.You look much prettier in the new dress.(变为感叹句)
问题解答：
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