“Do”和“Does”都是助动词，用于构成疑问句和否定句，但它们的使用取决于主语的人称和数。
| 用法 | 主语 | 助动词 | 例句 |
| 一般现在时疑问句 | I/You/We/They | Do | Do you like coffee? |
| 一般现在时疑问句 | He/She/It | Does | Does she go to school? |
| 一般现在时否定句 | I/You/We/They | Don t | I don t like it. |
| 一般现在时否定句 | He/She/It | Doesn t | She doesn t eat meat. |
总结：Do用于第一人称、第二人称和复数主语，Does用于第三人称单数。正确使用有助于语法准确，避免混淆。
