题目内容
【题目】He often watches films with his father . (改为否定句）
He often films with his father.
【答案】doesn't；watch
【解析】肯定句句意：他经常和他父亲一起看电影。改成否定句后的句意是：他不经常和他父亲一起看电影。否定句需要助动词和否定词not，因为主语He属于单三，所以助动词用单三形式does与主语保持一致. does not=doesn't. 否定句结构是：主语+doesn't +动词原形+其它句子成分。所以答案是：①doesn't ② watch
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