问题描述：
第三人称单数,动词后是不是要加s 或es
susan can't speak English.此句话中speak为什么不加s susan是一个人名第三人称单数,动词后应该加s或es啊?
2,saly is going to type he boss's 此处type后为什么不加s
3,His sister can cook for the family.此处也是第三人称单数,cook后为什么不加s
susan can't speak English.此句话中speak为什么不加s susan是一个人名第三人称单数,动词后应该加s或es啊?
2,saly is going to type he boss's 此处type后为什么不加s
3,His sister can cook for the family.此处也是第三人称单数,cook后为什么不加s
问题解答：
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