The difference between ce qui and ceux qui boils down to what they refer to and whether the idea is singular or plural.

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1. ce qui

• Meaning: what / that which / the thing that (singular, neutral – no gender or number)
• Use: Refers to an unspecified thing or idea that is singular in meaning.
• Grammar: “ce” is an invariable demonstrative pronoun meaning this/that, and “qui” is a subject relative pronoun (who / which).
• Example:
  • Ce qui est important, c’est de rester calme.
    → What is important is to stay calm.
  • Tu ne comprends pas ce qui s’est passé.
    → You don’t understand what happened.

Key point: ce qui is neutral and can refer to both concrete and abstract things, but it’s singular in meaning.

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2. ceux qui

• Meaning: those who / the ones who (plural, masculine – or mixed gender)
• Use: Refers to people or things in the plural that have already been identified or are being distinguished from others.
• Grammar: “ceux” is the masculine plural form of the demonstrative pronoun (celui, celle, ceux, celles), and “qui” is the subject relative pronoun.
• Example:
  • Ceux qui travaillent dur réussissent souvent.
    → Those who work hard often succeed.
  • J’admire ceux qui osent dire la vérité.
    → I admire those who dare to tell the truth.

Key point: ceux qui is plural and usually refers to people (or sometimes objects, if personified or clearly plural).

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Quick Comparison Table

Expression	Number & Gender	Refers to	Translation examples
ce qui	Singular, neutral	An unspecified thing or idea	what / that which
ceux qui	Plural, masculine/mixed	People or things in plural	those who / the ones who

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💡 If you want the feminine plural version of ceux qui, you’d say celles qui → those (feminine) who…

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Examples Comparing “ce qui” vs “ceux qui”

With ce qui (singular, neutral: “what / that which…”)	With ceux qui (plural, masculine/mixed: “those who…”)
Ce qui me dérange, c’est le bruit. → What bothers me is the noise.	Ceux qui me dérangent, ce sont mes voisins. → Those who bother me are my neighbours.
Tu ne comprends pas ce qui est en jeu. → You don’t understand what’s at stake.	Tu ne comprends pas ceux qui travaillent ici. → You don’t understand those who work here.
Ce qui est difficile, c’est de commencer. → What is difficult is starting.	Ceux qui trouvent ça difficile abandonnent vite. → Those who find it difficult give up quickly.
J’aime ce qui est simple et clair. → I like what is simple and clear.	J’aime ceux qui sont simples et clairs. → I like those who are simple and clear.
Ce qui compte, c’est la sincérité. → What matters is sincerity.	Ceux qui comptent sur toi doivent être patients. → Those who count on you must be patient.

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🔑 Summary:

• ce qui points to an idea, fact, or “thing” (always singular in sense).
• ceux qui points to people or plural entities (like “the ones who…”).