一、Be动词是什么?

Be动词是英语里最基础的动词之一,意思是"是"。在中文里,我们说"我是学生""你是朋友",这个"是"就是Be动词的意思!

💡 对比理解

学生 → I am a student.

朋友 → You are a friend.

一只猫 → It is a cat.

英语里的Be动词有三种形式:am、is、are。不同的"人"要用不同的形式哦!

二、am / is / are 用法口诀

🎵 记忆口诀(跟着唱):

我用am,你用are
is连着他她它。
单数名词用is
复数名词全用are

(唱两遍就会啦!)
1. am —— 只和 I 搭配
📝 例句

I am a student. 我是一名学生。

I am happy. 我很开心。

I am seven years old. 我七岁了。

💡 小提示:am 只能和 I 一起用,不要记错啦!
2. is —— 他/她/它,还有单数
📝 例句

He is my brother. 他是我的哥哥。

She is my teacher. 她是我的老师。

It is a dog. 它是一只狗。


The cat is cute. 这只猫很可爱。(单数名词)

My book is red. 我的书是红色的。(单数名词)

3. are —— 你/你们/我们/他们,还有复数
📝 例句

You are my friend. 你是我的朋友。

We are classmates. 我们是同学。

They are students. 他们是学生。


The dogs are big. 这些狗很大。(复数名词)

My books are new. 我的书是新的。(复数名词)

三、肯定句、否定句、疑问句

1. 肯定句(陈述事实)

结构:主语 + am/is/are + 其他

📝 例句

I am a boy. 我是一个男孩。

She is tall. 她很高。

They are friends. 他们是朋友。

2. 否定句(说"不")

结构:主语 + am/is/are + not + 其他

📝 例句

I am not sad. 我不难过。

He is not at home. 他不在家。

We are not tired. 我们不累。

💡 缩写:is not = isn't,are not = aren't,am not 不能缩写哦!
3. 疑问句(提问)

结构:Am/Is/Are + 主语 + 其他?

📝 例句

Are you happy? 你开心吗?
→ Yes, I am. / No, I'm not.


Is he a doctor? 他是医生吗?
→ Yes, he is. / No, he isn't.


Are they students? 他们是学生吗?
→ Yes, they are. / No, they aren't.

四、缩写形式

在口语和日常写作中,我们经常把Be动词和前面的词缩写在一起,这样更自然、更顺口!

完整形式 缩写形式 例句
I am I'm I'm a student.
You are You're You're nice.
He is He's He's tall.
She is She's She's kind.
It is It's It's a cat.
We are We're We're friends.
They are They're They're happy.
is not isn't He isn't here.
are not aren't They aren't late.
🌟 小提醒:am not 没有缩写形式哦!不能说 "I amn't",要说 "I'm not"。

五、趣味小故事 🐱

📖 小猫找朋友

一只小猫(It)想交朋友。

它看到一只小狗,问:"Are you my friend?"(你是我的朋友吗?)

小狗说:"Yes, I am!"(是的,我是!)

它们又看到一只小鸟,问:"Is it our friend?"(它是我们的朋友吗?)

小鸟说:"Yes, I am! We are good friends!"(是的,我是!我们是好朋友!)


🎉 从此,它们三个成为了最好的朋友!

六、练习题

🧠 练习一:选择 am, is 或 are 填空

  1. I _______ a pupil.
    查看答案am(I 搭配 am)
  2. She _______ my mother.
    查看答案is(she 搭配 is)
  3. The cats _______ cute.
    查看答案are(复数用 are)
  4. We _______ in the classroom.
    查看答案are(we 搭配 are)
  5. My dog _______ brown.
    查看答案is(单数用 is)

🧠 练习二:连线题

把左边和右边正确的搭配连起来:

1. I

2. You

3. He

4. They

5. The book

a. is

b. are

c. am

查看答案

1-c (I am)

2-b (You are)

3-a (He is)

4-b (They are)

5-a (The book is)

🧠 练习三:改写句子

把下面的句子改成否定句和疑问句:

  1. He is a teacher.
    否定句:
    查看答案He is not/isn't a teacher.

    疑问句:
    查看答案Is he a teacher?
  2. They are happy.
    否定句:
    查看答案They are not/aren't happy.

    疑问句:
    查看答案Are they happy?
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