Its 和 it's 连经验丰富的写作者也会弄错，因为在英语里，撇号（'）通常表示所属关系。但对 it 来说，规则正好相反。

简短回答 #

单词 含义 例句
it's it is 或 it has 的缩写 It's raining. It's been a long day.
its 它的（属于它的） The dog wagged its tail.

It's = it is / it has #

It's 永远是缩写形式，撇号代替了省略掉的字母。

  • It's cold outside. → It is cold outside.
  • It's been a week. → It has been a week.

Its = 它的 #

Its 是物主代词，和 his、hers、ours 一样。这些词都没有撇号，its 也不例外。

  • The company changed its logo.（公司换了它的标志。）
  • Every plant needs its own pot.（每株植物都需要自己的花盆。）

你只需要这一个测试 #

把句子里的这个词换成 “it is” 或 “it has”，再大声读一遍。

  • 如果说得通，就写 it's。
  • 如果听起来不对，就写 its。

The app updates ___ design every year. → "The app updates it is design"？说不通。所以用：its。

常见错误 #

错误 正确
The cat licked it's paw. The cat licked its paw.
Its a great idea. It's a great idea.
Its' 英语中不存在这种写法。

自动帮你发现 #

its 和 it's 都是真实存在的单词，所以拼写检查不会标出用错的那个。AI Grammar Checker 能理解整个句子，一键帮你改对。