Meaning
As a precaution, if a certain situation occurs.
Cultural Background
The French 'prévoyance' is a social value. Being prepared 'au cas où' is seen as a sign of intelligence and respect for others' time. In Quebec, 'au cas où' is just as common, but you might also hear 'juste au cas', which is a direct calque from English 'just in case'. Belgian French uses 'au cas où' identically to France, often in administrative contexts which are famously complex. Swiss French speakers value precision; 'au cas où' is used frequently in professional and outdoor (hiking/skiing) contexts.
The Standalone Power
Use 'au cas où' at the end of a sentence to sound instantly more like a native speaker. It adds a layer of mystery or caution.
Mood Alert
Never use the present tense after 'au cas où'. It's the most common mistake for English speakers.
Meaning
As a precaution, if a certain situation occurs.
The Standalone Power
Use 'au cas où' at the end of a sentence to sound instantly more like a native speaker. It adds a layer of mystery or caution.
Mood Alert
Never use the present tense after 'au cas où'. It's the most common mistake for English speakers.
Polite Refusal
You can use 'au cas où' to politely decline an offer while leaving the door open: 'Merci, je garde ton numéro au cas où !'
Test Yourself
Complete the sentence with the correct form of the verb in the conditional mood.
Je prends une carte au cas où nous nous _______ (perdre).
'Au cas où' must be followed by the conditional present 'perdrions'.
Which sentence is grammatically correct?
Choose the correct option:
Only the conditional 'pleuvrait' is correct after 'au cas où'.
Complete the dialogue with the most natural response.
A: Tu as pris ton chargeur ? B: Oui, _______.
The elliptical 'au cas où' is the most natural way to say 'just in case' at the end of a sentence.
Match the precaution to the 'au cas où' scenario.
Match: 1. Parapluie, 2. CV, 3. Cash
These are the logical 'Plan B' scenarios for each item.
🎉 Score: /4
Visual Learning Aids
Practice Bank
4 exercisesJe prends une carte au cas où nous nous _______ (perdre).
'Au cas où' must be followed by the conditional present 'perdrions'.
Choose the correct option:
Only the conditional 'pleuvrait' is correct after 'au cas où'.
A: Tu as pris ton chargeur ? B: Oui, _______.
The elliptical 'au cas où' is the most natural way to say 'just in case' at the end of a sentence.
Match: 1. Parapluie, 2. CV, 3. Cash
These are the logical 'Plan B' scenarios for each item.
🎉 Score: /4
Frequently Asked Questions
10 questionsNo, standard French requires the conditional mood. Using the subjunctive is considered a mistake.
It is neutral. You can use it with your boss or your best friend.
'Si jamais' is more informal and implies a broader, more random possibility.
It's a common mistake made by some native speakers. It's best to avoid it.
Yes, e.g., 'Au cas où tu changerais d'avis, préviens-moi.'
It is always 'au cas où'. 'En cas de' is used with nouns.
Simply say '..., au cas où.'
Yes, but you use the conditional past: 'au cas où il aurait oublié'.
Very much so, for risk management and contingency planning.
'Dans l'éventualité où' is the most formal equivalent.
Related Phrases
À tout hasard
similarOn the off chance
En cas de
specialized formIn case of [noun]
Si jamais
informalIf ever
Dans l'éventualité où
formalIn the event that
