否定句中"doesn't"的改法是在原句中第三人称单数主语后直接加"doesn't"，同时将动词改为原形。例如：
She likes apples. → She doesn't like apples.
He finishes homework every day. → He doesn't finish homework every day.
规则总结
时态匹配：
用于一般现在时第三人称单数主语（如he/she/it）
需与助动词"does"搭配使用，后接动词原形
结构调整：
否定词"doesn't"置于主语后，动词恢复原形（如"likes"→"like"）
常见错误：
避免保留动词原形（如"He doesn't plays"→"He doesn't play"）
需与主语人称和数一致（如"They don't play soccer"）
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