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助动词和动词加 s 的规则

助动词是与实义动词也叫行为动词相对而言的。助动词包括：

  • do
  • be: am, is, are, was, were
  • have
  • can
  • should

陈述句中​

第三人称单数加 s​

第三人称单数：he, she, it, 以及单数名词。如：

  • He likes apples.
  • The dog likes apples.
  • Does he like apples? Yes, he does. / No, he doesn't.

其他人称不加 s​

其他人称：

  • 第一人称：I
  • 第二人称：you
  • 第三人称复数：they
  • 复数名词：dogs

如：

  • I like apples.
  • They like apples.

疑问句中​

在疑问句中，助动词符合陈述句的规则，动词不加 s。如：

  • Does he like apples? Yes, he does. / No, he doesn't.
  • What does she like? She likes apples.