Can and Can’t for Ability: A1 English Grammar

Raúl Maguiña

Fundador de Langcom | Examinador de Cambridge y del SIELE

julio 18, 2026

A1✏️ Gramática⏱️ 3 minutos de lectura
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, o they. You always use the base form of another verb (the infinitive without ‘to’) right after can o can’t. Por ejemplo, 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, o 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 do o does 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

Ejemplos

  • 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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Errores habituales de los hispanohablantes

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.
  • Uso de don’t o doesn’t for negatives:
    I don’t can speak French.
    I can’t speak French.

Preguntas más frecuentes

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 can o can’t. Por ejemplo, can run, not can to run.

What is the short form of ‘cannot’?

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

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Sobre el autor: Raúl Maguiña

Raúl Maguiña es el director de la Asociación Educativa Langcom, un centro autorizado de preparación para el examen Cambridge English en EE.UU.. Con más de una década de experiencia en la enseñanza de idiomas y la certificación internacional, ha ayudado a miles de estudiantes, profesores e instituciones educativas de 25 países a conseguir las certificaciones de inglés de Cambridge, IELTS, TOEFL y Michigan.

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