定义 / 说明
在 Present Simple 中，我们用 do not 或 does not 构成否定句。缩写 don't 和 doesn't 在日常英语中非常常见。don't / doesn't 后面要用动词原形，而不是 -s 形式。这和肯定句不同，因此是常见错误点。
关键规则
- I, you, we, they 用 don't。
- he, she, it 用 doesn't。
- don't/doesn't 后用动词原形：don't like, doesn't work。
- doesn't 后主语动词不要再加 -s。
- be 的否定不同：用 isn't, aren't，不用 doesn't be。
例句
- I don't drink coffee. - 我不喝咖啡。
- You don't need this book. - 你不需要这本书。
- We don't live here. - 我们不住在这里。
- He doesn't drive. - 他不会开车/他不开车。
- She doesn't like cold weather. - 她不喜欢冷天气。
- It doesn't work now. - 它现在坏了（不能工作）。
常见错误
- ❌ He doesn't likes tea. -> ✅ He doesn't like tea.
- ❌ I doesn't know. -> ✅ I don't know.
- ❌ She doesn't at home. -> ✅ She isn't at home.
提示
- 一个 -s 就够了：doesn't 已经带有第三人称信息。