一般现在时与第三人称单数
一、什么是一般现在时？
一般现在时用来表达： - 经常做的动作：I go to school every day. - 客观事实：The sun rises in the east. - 现在的状态：She is a student.
二、动词的变化——第三人称单数
当主语是 he/she/it 或单个的人/物时，动词要加s或es。
变化规则
| 规则 | 示例 |
|---|---|
| 一般动词加 -s | play → plays, like → likes |
| 以 s/x/sh/ch/o 结尾加 -es | go → goes, watch → watches, wash → washes |
| 辅音+y 变 y 为 ies | study → studies, fly → flies |
| 特殊变化 | have → has, do → does |
口诀
主语三单（he/she/it）动词变， 一般直接加个s， s/x/sh/ch/o 加es， 辅音+y 变 ies， have变成has要牢记！
三、句型结构
肯定句：
主语 + 动词(三单形式) + 其他 He likes apples. She goes to school by bus.
否定句（需要助动词 doesn't）：
主语 + doesn't + 动词原形 + 其他 He doesn't like apples. She doesn't go to school by bus.
一般疑问句：
Does + 主语 + 动词原形 + 其他？ Does he like apples? —— Yes, he does. / No, he doesn't.
注意： 用了does或doesn't，动词就要变回原形！
四、常见时间标志词
| 单词 | 意思 | 例句 |
|---|---|---|
| always | 总是 | He always gets up early. |
| usually | 通常 | I usually walk to school. |
| often | 经常 | She often reads books. |
| sometimes | 有时 | We sometimes play football. |
| rarely | 很少 | He rarely watches TV. |
| never | 从不 | She never eats meat. |
| every day | 每天 | They play every day. |
| once a week | 每周一次 | He visits his grandma once a week. |
五、对比例子
看下面两组句子，注意动词的变化：
I 开头（不用三单）： - I get up at 6:00. - I do my homework in the evening.
He/She 开头（用三单）： - She gets up at 6:00. - He does his homework in the evening.
六、小练习
用所给词的适当形式填空：
- My mother _____ (cook) dinner every day.
- They _____ (go) to school on foot.
- He _____ (have) a new bike.
- _ your father ___ (watch) TV in the evening?
- Tom _____ (not like) playing football.
答案：1. cooks 2. go 3. has 4. Does...watch 5. doesn't like