一般现在时三单：动词变化规则 + 主语判断（非你非我非复数）+ 高频易错点
引言
一般现在时里最常丢分的考点就是动词三单：什么时候加 s，什么时候用原形？一句话判断主语就行。
先判断主语：非你非我非复数 → 三单
```text
动词用原形的主语：I、you、we、they、复数名词（two cats）
动词用三单的主语：he、she、it、人名（Tom）、单个名词（a cat）
```
```text
I have two cats. 我（第一人称）→ 原形 have
Tom has two cats. Tom（人名，三单）→ has
The cat has two eyes. 单数名词 → has
They have two cats. 复数 → 原形 have
```
三单变化规则
```text
① 一般情况直接加 s
like → likes play → plays read → reads
② s / x / ch / sh 结尾加 es
watch → watches brush → brushes box → boxes
③ 辅音字母 + y 结尾：变 y 为 i 加 es
study → studies fly → flies carry → carries
（元音 + y 直接加 s：play → plays）
④ o 结尾加 es
go → goes do → does
⑤ 不规则
have → has
```
两个高频易错点
```text
易错 1：my / your 不是主语
My father goes to work by subway every day.
（my 只是物主代词，真正主语是 father → 三单 goes）
易错 2：does / doesn't 后面动词还原
She doesn't like apples. （不是 doesn't likes）
Does he watch TV? （不是 Does he watches）
```
一般现在时的标志词
```text
every day / every evening / every morning
often / usually / always / sometimes
```
```text
She often reads books after school.
她经常放学后读书。（三单 reads）
```
实战练习
```text
- He ______ (like) apples.
→ likes（三单主语）
- My brother ______ (not like) apples.
→ doesn't like（doesn't 后还原原形）
- The sun ______ (rise) in the east.
→ rises（单数主语 the sun）
- They ______ (have) a new classroom.
→ have（复数主语，原形）
```
总结
```text
非你非我非复数 → 动词三单
三单变化：加 s / 加 es / y 变 i 加 es / have→has
does、doesn't 后面动词必须用原形
```
```text
今日小抄：
He likes apples.
My father goes to work by subway.
She doesn't like apples.
```