一、主谓一致（Subject–Verb Agreement）
定义
主谓一致是指句子的主语（Subject）和谓语动词（Verb）在人称和数上保持一致。
基本规则
例句
[S He] [V works].
[S They] [V work].
二、第三人称单数（Third Person Singular）
1. 概念
第三人称单数包括：
- he / she / it
- 单数名词（如：the student, the teacher, the company）
| 类型 | 例子 |
|---|
| 人 | he, she |
| 物 / 抽象 | it |
| 单数名词 | a student, the teacher, my friend |
当主语为第三人称单数时，谓语动词需发生变化。
当主语是 I / You / We / They / 复数名词时，动词用原形
例句
- I study Korean every day.
- We have classes in the morning.
- They live in Seoul.
- Many Chinese students work part-time in Korea.
四、动词加 -s / -es 规则
1. 一般情况：直接加 -s
study → studies
- live → lives
- work → works
2. 以 -s / -sh / -ch / -x / -o 结尾 → 加 -es
- go → goes
- watch → watches
- teach → teaches
3. 辅音 + y → 变 y 为 i + es
- study → studies
- try → tries
五、否定句
1. 非第三人称单数
do not (don’t) + 动词原形
- I do not have time today.
- They don’t understand the lecture.
2. 第三人称单数
does not (doesn’t) + 动词原形
⚠️ 注意：动词不再加 -s
- He does not have time today.
- She doesn’t understand the lecture.
六、一般疑问句
1. 非第三人称单数
Do + 主语 + 动词原形？
- Do you live in Seoul?
- Do they have Korean classes today?
2. 第三人称单数
Does + 主语 + 动词原形？
- Does she live in Seoul?
- Does your friend work part-time?
七、练习
选择正确答案：
- She (study / studies) Korean every day.
- They (live / lives) near the university.
- He (don’t / doesn’t) have time today.
- Does your friend (work / works) part-time?
- My teacher (speak / speaks) Korean and English.