定义 / 说明
It's 与 its 形式非常接近，但功能不同。It's 是 it is 或 it has 的缩写；its 是表示所属的物主形式。两者在口语里发音相近、书面都高频，所以很容易混淆。这既是语法问题，也是标点问题，因为撇号会改变意义。快速检查法是看能否替换成 it is 或 it has。
关键规则
- It's = it is 或 it has。
- Its 表示所属：The company changed its plan.
- 可将 it's 展开为 it is 进行判断。
- 物主代词通常不带撇号：my, your, his, her, its, our, their。
- 这是英语写作中最常见错误之一。
例句
- It's a long day. - 今天很漫长。
- It's been a difficult week. - 这一周一直很艰难。
- The dog hurt its paw. - 那只狗伤到了它的爪子。
- The company changed its plan. - 公司改变了它的计划。
- I think it's going to rain. - 我觉得要下雨了。
常见错误
- ❌ The company changed it's plan. -> ✅ The company changed its plan.
- ❌ Its a long day. -> ✅ It's a long day.
- ❌ The cat cleaned it's face. -> ✅ The cat cleaned its face.
提示
- 能替换成 it is 或 it has 就用 it's；否则用 its。