Cannot vs Impossible vs Unable

Quand utiliser chacun en anglais, avec le sens, le registre et des exemples.

Cannot

Top 1000 (très courant)A1

Impossible

Top 1000 (très courant)A2

Unable

Top 2000 (courant)B1adjective
 CannotImpossibleUnable
Prononciation🇬🇧 /["/ˈkænɒt/"]/🇺🇸 /["/ˈkænɑːt/"]/🇬🇧 /["/ɪmˈpɒsəbl/"]/🇺🇸 /["/ɪmˈpɑːsəbl/"]/🇬🇧 /["/ʌnˈeɪbl/"]/🇺🇸 /["/ʌnˈeɪbl/"]/
Sensto be unable to do somethingNot able to happen or be done.not able to do something
ExempleI cannot believe the price of the tickets!Climbing that mountain seems impossible without proper training.I was unable to attend the meeting due to a family emergency.
RegistreNeutreNeutreNeutre
FréquenceTop 1000 (très courant)Top 1000 (très courant)Top 2000 (courant)
Niveau CEFRA1A2B1
Nature grammaticaleadjective
Collocationscannot believe, cannot wait, cannot affordappear, be, look, absolutely, completely, downright, for, be, become, find somebody, really, absolutely, completelyappear, be, feel, completely, quite, totally, unwilling or unable
Antonymescan, ablepossible, feasible, achievableable, capable
Erreurs fréquentesConfused with 'can not' — it's always one word in negative form., Using 'cannot' in too formal a context — prefer 'can't' in casual speech., Incorrectly using 'cannot' in past tense situations.'Impossible' is sometimes confused with 'unbelievable' but they are not the same., Learners might use 'impossible' to describe very challenging tasks instead of things that cannot be done at all., 'Impossible' is often incorrectly combined with less strong modifiers, like 'very impossible'.Confused with 'unable to' and 'not able to' — they mean the same but usage can vary., Using 'unable' without a following action verb., Misplacing adjectives — remember 'unable' always describes capability.
Notes d'usageUse 'cannot' in any situation where something is impossible. Avoid using it in informal contexts where 'can't' is more common.Use 'impossible' to describe something that cannot be achieved. It’s suitable for both spoken and written English but may be too strong in polite contexts.Use 'unable' in situations where someone or something lacks the ability to perform an action. It's appropriate in both spoken and written contexts, but avoid in very casual conversations.

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Impossible

Questions fréquentes : Cannot vs Impossible vs Unable

Quelle est la différence entre Cannot, Impossible et Unable ?

Cannot: to be unable to do something Impossible: Not able to happen or be done. Unable: not able to do something

Lequel est le plus avancé : Cannot, Impossible et Unable ?

Unable est le niveau le plus élevé, à B1, sur l'échelle CEFR.

Cannot, Impossible et Unable sont-ils au même niveau CEFR ?

Cannot: A1, Impossible: A2, Unable: B1 sur l'échelle CEFR.

Peux-tu montrer un exemple de chacun ?

Cannot: I cannot believe the price of the tickets! Impossible: Climbing that mountain seems impossible without proper training. Unable: I was unable to attend the meeting due to a family emergency.

Puis-je utiliser Cannot, Impossible et Unable de façon interchangeable ?

Pas toujours. Cannot, Impossible et Unable sont proches et se recoupent parfois, mais elles diffèrent par le registre, la fréquence et l'usage, donc remplacer l'une par l'autre peut changer le sens ou le ton. Regarde les différences ci-dessus avant de substituer.