Mastering Can and Can't for Ability (B1 English Grammar) — B1 English grammar lesson by Langcom

Mastering Can and Can’t for Ability (B1 English Grammar)

Raúl Maguiña

Fondateur de Langcom | Examinateur pour les examens de Cambridge et du SIELE

septembre 15, 2026

B1✏️ Grammaire⏱️ 4 min de lecture📅 Mise à jour en septembre 2026
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Can et can’t are essential modal verbs in English used to express present ability. Vous utilisez can to say what someone or something is able to do, like I can speak English. It’s a simple and direct way to talk about skills or possibilities that exist right now. For example, She can play the guitar very well means she has the skill to do it. To express a lack of ability, you use can’t (ou cannot), as in He can’t swim, meaning he lacks the skill. When asking about someone’s ability, you put can at the beginning of the question: Can you help me? N'oubliez pas que, can does not change form for different subjects (e.g., I can, she can), and you always follow it with the base form of another verb, without ‘to’. This makes it very straightforward to use for B1 learners.

What Does Can Mean in English?

Can is a modal verb. We use can to talk about abilities, skills, or possibilities that exist in the present.

It means that someone has the knowledge, skill, or opportunity to do something.

  • Structure: Subject + can + base form of verb

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How Do We Use Can't?

Can't is the negative form of can. It means cannot. Nous utilisons can't to express a lack of ability, skill, or possibility in the present.

It tells us that someone is not able to do something.

  • Structure: Subject + can't + base form of verb

Asking About Ability: Can Questions

To ask if someone has an ability, we put can au début de la phrase.

Nous utilisons can before the subject to form questions.

  • Structure: Can + subject + base form of verb?

For short answers, we use Yes, subject + can. ou No, subject + can't.

Important Rules for Can and Can't

Can et can't are special verbs called modal verbs. They follow specific rules:

  • No 'to' after can: Always use the base form of the main verb directly after can, without 'to'.
    Exemple : I can swim. (PAS I can to swim.)
  • Same form for all subjects: Can does not change for 'he', 'she', or 'it'. It stays the same for all subjects.
    Exemple : He can speak Spanish. (PAS He cans speak Spanish.)
  • No auxiliary verbs: We do not use do ou does with can for questions or negatives.
    Exemple : Can you help me? (PAS Do you can help me?)
Summary of Can and Can't for Ability
Formulaire Example Sentence
Positive I can swim.
Negative She can't sing.
Question Can you dance?
Short Answer (Yes) Yes, I can.
Short Answer (No) No, I can't.

Exemples

  • I can speak three languages.
  • She can play the piano very well.
  • My brother can't cook at all.
  • We can't go to the party tonight.
  • Can you help me with this exercise?
  • Can they understand English?
  • Yes, I can.
  • No, he can't.

Entraînement

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Erreurs courantes chez les hispanophones

Many Spanish speakers might incorrectly add 'to' after can, similar to how they might use 'poder + infinitivo' in Spanish.

  • Incorrect : I can to speak English.
  • Correct : I can speak English.

Another common error is changing the form of can for different subjects, especially for 'he/she/it'.

  • Incorrect : She cans sing.
  • Correct : She can sing.

Also, avoid using auxiliary verbs like do ou don't with can for questions or negatives.

  • Incorrect : Do you can play tennis?
  • Correct : Can you play tennis?

Questions fréquemment posées

What is the difference between can and be able to?

Can is more common for general present ability. Be able to is more formal and can be used in all tenses, especially when can is not grammatically possible (e.g., future: I will be able to help you.).

Can 'can' be used for permission?

Oui, can can also be used to ask for or give permission (e.g., Can I sit here? ou You can go now.). However, this lesson focuses on its use for ability.

Is 'can' used for future ability?

No, for future ability, we typically use will be able to. For example, I will be able to visit next week. (PAS I can visit next week if you mean future ability).

How is 'can' different from 'could'?

Can is used for present ability (e.g., I can run fast now.). Could is the past form of can and is used for past ability (e.g., When I was young, I could run fast.).

Leçons associées

À propos de l'auteur : Raúl Maguiña

Raúl Maguiña est le directeur de l'Asociación Educativa Langcom, un centre agréé de préparation à l'examen Cambridge English situé à votre pays. Fort de plus d'une décennie d'expérience dans l'enseignement des langues et les certifications internationales, il a aidé des milliers d'étudiants, d'enseignants et d'établissements d'enseignement dans 25 pays à obtenir les certifications d'anglais Cambridge, IELTS, TOEFL et Michigan.

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