French Phrase
Ça s'est passé quand ?
Meaning
Literally “That happened when?” – a casual way to ask for the moment an event occurred. It is used when the speaker already knows something happened and just wants to know the time.
When to use
Use this phrase in informal conversation with friends, family, or classmates when you need the timing of a past event. It’s less formal than the inverted form *Quand cela s'est‑il passé ?*.
✦Grammar Breakdown
Ças'estpasséquand?
Ça
Demonstrative pronoun meaning “that/it”, used to refer to a situation previously mentioned.
s'est
Reflexive pronoun + auxiliary verb *être* in the passé composé; contracts to *s'est*.
passé
Past participle of the verb *se passer* (to happen, to take place).
quand
Interrogative adverb meaning “when”. Placed at the end of the sentence in informal spoken French.
?
The question mark signals that the whole clause is a question.
🗨In Conversation
J’ai vu le feu d’artifice hier soir.
I saw the fireworks last night.
Ça s'est passé quand ?
When did it happen?
✕Common Mistakes
C'est passé quand ?
Missing the reflexive pronoun *s'*; the correct form is *Ça s'est passé quand ?* because the verb is *se passer*.
Quand ça s'est passé ?
Grammatically correct but sounds slightly formal; native speakers usually say *Ça s'est passé quand ?* in casual speech.
Ça s'est passé quand
Omitting the question mark can make the sentence read as a statement rather than a question.
↔Alternatives
Quand cela s'est‑il passé ?
When did that happen? (formal)
C'est quand que ça s'est passé ?
When did it happen? (very colloquial)
À quel moment cela s'est passé ?
At what moment did it happen? (more precise)
Cultural Tip
In spoken French, placing *quand* at the end of the clause (*Ça s'est passé quand ?*) is the most natural, especially among peers. In written or formal contexts, French prefers inversion (*Quand cela s'est‑il passé ?*) or the use of *à quel moment*. Remember that *ça* is informal; replace it with *cela* for a more polished tone.