【do和does到底该怎么用】在英语学习中，"do" 和 "does" 是两个非常常见的助动词，但很多学习者在使用时容易混淆。它们的正确用法取决于主语的人称和数。下面我们将通过和表格的形式，清晰地讲解“do”和“does”的用法。
一、
"do" 和 "does" 都是用于构成一般现在时的疑问句和否定句的助动词。它们的作用是帮助动词形成正确的结构，特别是在提问或否定时。
- do 用于第一人称（I）、第二人称（you）以及复数形式（we, they）。
- does 用于第三人称单数（he, she, it）。
当主语是第三人称单数时，动词要恢复原形（即不加-s），而助动词则用 "does"。
例如：
- I do my homework every day.（我每天做作业。）
- He does his homework every day.（他每天做作业。）
此外，在疑问句和否定句中，也必须使用 "do" 或 "does" 来引导句子。
二、表格对比
| 主语 | 助动词 | 例句（肯定） | 例句（疑问） | 例句（否定） |
| I | do | I do my homework. | Do I do my homework? | I do not do my homework. |
| You | do | You do your homework. | Do you do your homework? | You do not do your homework. |
| We | do | We do our homework. | Do we do our homework? | We do not do our homework. |
| They | do | They do their homework. | Do they do their homework? | They do not do their homework. |
| He | does | He does his homework. | Does he do his homework? | He does not do his homework. |
| She | does | She does her homework. | Does she do her homework? | She does not do her homework. |
| It | does | It does its homework. | Does it do its homework? | It does not do its homework. |
三、小贴士
- 当主语是 “I, you, we, they” 时，用 do。
- 当主语是 “he, she, it” 时，用 does。
- 在疑问句和否定句中，动词要恢复为原形（如：do → do, does → do）。
- 注意不要混淆 “do” 和 “does” 的用法，尤其在口语中容易出错。
通过以上内容，相信你对 “do” 和 “does” 的用法有了更清晰的认识。练习时多注意主语的单复数和人称，就能避免常见的错误。
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