quand vs quant vs qu'en

Summary

quand = "when" (conjunction or question word: quand pars-tu ?); quant appears only in the fixed expression quant à/aux, "as for" (quant à moi, je reste); qu'en is que + en (Qu'en penses-tu ? = "what do you think of it?"). All are pronounced /kɑ̃/. Tests: followed by à/aux → quant; expandable to "que … de cela" → qu'en; otherwise → quand.

Explanation

Quand, quant, and qu'en are three written forms that all sound like /kɑ̃/ (with the liaison /t/ sometimes surfacing before a vowel: quand il pleut is heard as /kɑ̃.til.plø/). Despite sharing a sound, they play three completely different roles: quand is a conjunction or interrogative meaning "when"; quant survives only inside one fixed expression; qu'en is a contraction of the conjunction/pronoun que with the pronoun en.

Quand is by far the most common of the three. As a conjunction it introduces a time clause: quand il pleut, je reste chez moi ("when it rains, I stay home"). As a question word it asks about time: Quand pars-tu ? ("When are you leaving?"). In both uses, quand can be preceded or followed by almost anything except à or aux — its whole meaning is temporal, and it never needs an accompanying preposition to make sense.

Quant exists, for all practical purposes, in only one construction: quant à (before a masculine singular or a vowel-initial noun) and quant aux (before a plural noun), meaning "as for" or "regarding." It always introduces a topic shift: quant à moi, je reste ici ("as for me, I'm staying here"); quant aux enfants, ils dorment déjà ("as for the children, they're already asleep"). Because quant is never used on its own, the single most reliable test is mechanical: if à or aux immediately follows the word, it must be quant.

Qu'en is not one word but two fused by élision: the conjunction/relative que plus the pronoun en (which typically replaces de + a noun or the idea "of it/of that"). It shows up in questions like Qu'en penses-tu ? ("What do you think of it?", literally "what of-it do you think") and in restrictive constructions like il n'en parle qu'en privé ("he only talks about it in private" — here qu'en is actually ne...que + en, a different overlap worth noting separately). The test is to try expanding the phrase with "de cela": Qu'en penses-tu ? → Que penses-tu de cela ? works perfectly, confirming qu'en.

Putting the three tests together in order resolves every case. First ask: is à or aux immediately after the word? If yes, it is quant. If no, try expanding with "que … de cela": if that paraphrase works and preserves the meaning, it is qu'en. If neither test succeeds, the word is simply quand, doing its ordinary job of marking time.

In short: quand means "when" and is the default choice for anything temporal; quant appears exclusively before à/aux, meaning "as for"; and qu'en is que + en, paraphrasable as "que … de cela." Because quant is so restricted, learners who default to quand or qu'en whenever à/aux does not follow will rarely go wrong.

Examples

Quand il pleut, je reste chez moi. — When it rains, I stay home. (quand: temporal conjunction, no à/aux follows.)

Quand pars-tu en vacances ? — When are you leaving on vacation? (quand: interrogative asking about time.)

Quant à moi, je préfère rester ici. — As for me, I'd rather stay here. (quant à: fixed expression, always followed by à/aux.)

Quant aux résultats, ils seront annoncés demain. — As for the results, they will be announced tomorrow. (quant aux: same fixed expression before a plural noun.)

Ce livre a l'air intéressant ; qu'en penses-tu ? — This book looks interesting; what do you think of it? (qu'en: que + en, expandable to que penses-tu de cela ?)

Common mistakes

Related rules

• The pronoun en
• Question formation: intonation / est-ce que / inversion
• Logical connectors (cause, consequence, goal, opposition)