小学三年级英语下册常见的单词缩写形式主要包括以下内容：

一、be动词缩写

am→ I'm

are→ we're/ they're

is→ it's

are not→ aren't

is not→ isn't

常见错误：amn't（应为aren't）

二、情态动词缩写

can→ can't

do→ don't

will→ won't

should→ shouldn't

三、缩写形式示例

| 完整形式 | 缩写形式 | 例句 |

|----------------|----------|--------------------------|

| I am | I'm | I'm hungry. |

| We are | we're | We're playing soccer.|

| He is | he's | He's my friend. |

| It is | it's | It's sunny today. |

| They are | they're| They're in the park. |

| You are | you're| You're doing well. |

| What is | what's| What's your favorite food？ |

| Where is | where's | Where's the library？|

| How's| how's | How's your day going？ |

四、其他常见缩写

let's→ let us

have not→ haven't

do not→ don't

will not→ won't

五、易混淆点说明

it's是 it is的缩写，不可写成 amn't

that is缩写为 that's，注意与 their（they're）区分

建议结合例句记忆，并通过练习巩固书写规范。