【do的第三人称单数.】在英语语法中，动词“do”是一个非常常见的动词，用于构成一般疑问句、否定句以及强调句等。然而，当主语是第三人称单数（如he, she, it）时，“do”的形式需要发生变化，变成“does”。
一、总结
“Do”的第三人称单数形式是“does”，用于主语为he、she或it的情况下。使用“does”时，动词原形要恢复为原形，例如：
- He does his homework every day.
- She does not like coffee.
- Does he do his homework?
此外，在否定句和疑问句中，“does”还起到助动词的作用，帮助构成正确的语法结构。
二、表格展示
| 主语 | 肯定句（陈述句） | 否定句 | 疑问句 |
| I | I do my work. | I do not do my work. | Do I do my work? |
| You | You do your work. | You do not do your work. | Do you do your work? |
| He/She/It | He/She/It does his/her/its work. | He/She/It does not do his/her/its work. | Does he/she/it do his/her/its work? |
| We | We do our work. | We do not do our work. | Do we do our work? |
| They | They do their work. | They do not do their work. | Do they do their work? |
三、注意事项
1. “Does”只用于第三人称单数，其他主语使用“do”。
2. 在疑问句和否定句中，动词“do”或“does”后面接动词原形。
3. “Does”不能与“to”连用，除非是在不定式结构中，如“I want him to do it”，但此时“do”仍是原形。
通过正确使用“do”和“does”，可以更准确地表达句子的意思，并避免语法错误。掌握这一规则对于学习英语的基础语法非常重要。
以上就是【do的第三人称单数.】相关内容，希望对您有所帮助。
