Can and Can’t for Ability: A1 English Grammar

劳尔-马吉尼亚

Langcom 创始人 | 剑桥考试和SIELE考试考官

7 月 18, 2026

A1✏️ 语法⏱️ 阅读时间 3 分钟
To talk about what you are able to do, or what is possible, use the English word can. For things you are not able to do, or that are not possible, use can’t. Can is a special verb called a ‘modal verb’. This means it does not change its form for different subjects like I, you, he, 或 they. You always use the base form of another verb (the infinitive without ‘to’) right after cancan’t. 例如,, I can swim means you have the ability to swim. She can’t fly means she does not have the ability to fly. It’s a very common and useful verb for A1 learners to express abilities.

What Does ‘Can’ Mean in English?

Can is a modal verb. We use it to talk about ability. It means ‘poder’ in Spanish.

You use can to say that someone has the skill or the possibility to do something.

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How to Use ‘Can’ for Positive Ability (+)

To say what someone can do, follow this simple structure:

  • Subject + can + base form of the verb

The base form of the verb is the infinitive without ‘to’. For example, swim, not to swim.

How to Use ‘Can’t’ for Negative Ability (-)

To say what someone cannot do, or does not have the ability to do, use can’t.

Can’t is the short form of cannot. It is very common in spoken and written English.

  • Subject + can’t + base form of the verb

Remember: ‘Can’ is Special!

Can is a modal verb, so it has special rules:

  • It does not change for he, she, 或 it. You do not add -s.
  • You always use the base form of the next verb. Do not use to before the verb.
  • You do not use dodoes with can for negatives. Just use can’t.
Positive and Negative Forms of 'Can' for Ability
Subject Positive (+) Negative (-)
I can speak can’t speak
You can speak can’t speak
He/She/It can speak can’t speak
We can speak can’t speak
They can speak can’t speak

示例

  • I can speak English.
  • You can play the guitar.
  • He can run fast.
  • She can sing beautifully.
  • It can fly.
  • We can help you.
  • They can understand Spanish.
  • I can’t swim.
  • You can’t see me.
  • He can’t drive a car.
  • She can’t lift heavy boxes.
  • It can’t talk.
  • We can’t go today.
  • They can’t hear the music.

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西班牙语母语者常犯的错误

Spanish speakers sometimes make these mistakes with can:

  • Adding ‘to’ after can:
    I can to swim.
    I can swim.
  • Adding ‘-s’ for he/she/it:
    She cans play tennis.
    She can play tennis.
  • Using don’tdoesn’t for negatives:
    I don’t can speak French.
    I can’t speak French.

常见问题

What is the meaning of ‘can’?

Can means ‘poder’ in Spanish. We use it to express ability or possibility.

Does ‘can’ change for he/she/it?

No, can does not change. It is always can for all subjects (I, you, he, she, it, we, they).

What verb form comes after ‘can’ or ‘can’t’?

You always use the base form of the verb (the infinitive without ‘to’) after cancan’t. 例如,, can run, not can to run.

What is the short form of ‘cannot’?

The short form of cannotcan’t. It is very common in everyday English.

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关于作者:劳尔·马吉尼亚

劳尔·马吉尼亚是Langcom教育协会的主任,该协会是位于 美国. 凭借在语言教育和国际认证领域十余年的经验,他已帮助来自25个国家的数千名学生、教师和教育机构考取了剑桥英语证书以及IELTS、TOEFL和Michigan英语证书。.

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