当主语是第三人称单数时：动词变相应的第三人称单数形式肯定句：主语+动词s+其它否定句：主语+doesn‘t+动词原形+其它一般疑问句：Does+主语+动词原形+其它肯定回答 ：Yes，主语+does 否定回答： No，主语+doesn’t　　

He likes apples. He doesn’t like apples. Does he like apples? What does he like?