小学英语语法丨肯定句变否定句用法盘点!

✅肯定句改否定句，很多孩子容易漏 not、忘记动词变形。

这份方法盘点把规则梳理清楚，搭配典型例句，好懂又好记，刷题复习超实用，一起来看看吧～

📌口诀：有 be 有情直接加 not，无 be 无情助动词来帮；助动词一出，动词变原形；some 变 any，and 变 or，注意固定词别乱改！

一、分类方法

1. 句子有 be 动词（am/is/are/was/were）

✅ 规则：be 动词后面直接 + not

- am not（无缩写）；is not = isn't；are not = aren't

- was not = wasn't；were not = weren't

例句：

He is tall. → He is not (isn't) tall.

2. 句子有情态动词（can/may/must/should/will 等）

✅ 规则：情态动词后直接 + not

- can not = can't；will not = won't；should not = shouldn't

例句：

I can swim. → I can not (can't) swim.

3. 无 be、无情态动词（实义动词）

✅ 规则：加助动词 don’t /doesn’t /didn’t，后面动词变回原形

- 一般现在时：主语三单→doesn’t；主语非三单→don’t

- 一般过去时：全部用 didn’t

例句：

They like apples. → They don’t like apples.

She likes cats. → She doesn’t like cats.

He went home. → He didn’t go home.

二、配套变化要点（高频考点）

1. some → any （肯定句 some，否定句 any）

I have some pens. → I don’t have any pens.

2. and → or

He likes bread and milk. → He doesn’t like bread or milk.

3. already → yet（already 用于肯定句，yet 放否定句末尾）

4. 否定词：never, few, little, hardly 本身带否定含义，句子不再加 not

三、易错提醒

❌ 错：He doesn’t likes apples.

✅ 对：He doesn’t like apples.

> 只要出现助动词 don’t/doesn’t/didn’t，后面实义动词必须还原原形！

📝文末小练习（选择 + 填空）

一、按要求改写句子（填空）

1. I am a student.（改为否定句）

I ______ ______ a student.

2. They can play football.（改为否定句）

They ______ ______ football.

3. Tom watches TV every day.（改为否定句）

Tom ______ ______ TV every day.

4. We saw some birds.（改为否定句）

We ______ ______ ______ birds.

二、单项选择

( )1. My mother ______ shopping on Sundays.

A. doesn’t go  B. don’t go  C. doesn’t goes

( )2. There isn’t ______ water in the cup.

A. some  B. any  C. many

✅答案

填空：

1. am not

2. can’t play

3. doesn’t watch

4. didn’t see any

选择：1.A  2.B