掌握语法一致性，从判断主语与动词的关系开始
一、什么是“主谓一致”？
在英语中，谓语动词的形式必须与主语在“数”和“人称”上保持一致。
这一规则在写作、语法考试、口语表达中极为重要，是检验语言准确性的基本标准。
二、六类核心规则归纳
1. 第三人称单数，谓语动词须加 -s
✅ He likes books.
✅ The dog barks at strangers.
2. 主语为复数或第一、第二人称，动词保持原形
✅ They study hard.
✅ You look great.
3. 并列主语通常视为复数
✅ My brother and sister are at home.
✅ The teacher and the student have arrived.
4. 不可数名词，作单数处理
✅ Sugar is unhealthy in excess.
✅ Information travels fast.
5. 不定代词作主语，一律视为单数
✅ Everyone wants to win.
✅ Nobody knows the answer.
6. “There be”结构，谓语动词依首个主语决定
✅ There is a pen and two notebooks.
✅ There are many reasons to try again.
三、典型误区分析
| 常见错误句 | 正确写法 | 误区说明 |
|---|---|---|
| He go to school. | He goes to school. | 忽略三单加 -s |
| There is many problems. | There are many problems. | 动词不与“首主语”一致 |
| My friends likes music. | My friends like music. | 将复数误作单数 |
四、辨析训练（对比学习）
请判断下列句子主语是否为单数，动词是否正确：
- The news seem interesting.
- Mathematics is difficult.
- Each of them have a task.
- Time and tide waits for no one.
💡 提示：有些“单词看起来是复数”，实为单数，如 news、mathematics。
五、句型拓展与写作提示
在写句子时，建议按以下步骤思考：
- 识别主语 → 明确是单数、复数、可数、不可数，或是否由多个成分构成
- 判断人称和数 → 特别注意“it/he/she”与“they/we/you”对动词的影响
- 校验动词 → 是否符合该主语的人称/数
六、实战应用练习
请将以下句子改为主谓一致正确形式：
- The teacher and the student is in the room.
- Each of us have a notebook.
- There is many reasons for this result.
- She walk to school every morning.
主谓一致并非难以理解的语法术语，而是构成标准英语句式的必要条件。我们建议学生在日常英语写作和阅读中主动识别句式结构，强化“动词一致性”意识。借助「李校英语语言训练系统」，你可以进行句型识别、动词判断、结构匹配等多维度智能训练，帮助你在理解语法的基础上，实现表达上的准确性和自然度。现在就进入系统，检验你是否真正掌握主谓一致。