sa vs ça (vs çà)
Summary
sa is the feminine singular possessive adjective "his/her" (sa maison, always before a feminine noun); ça is the informal pronoun "that/it," short for cela (ça va, ça m'énerve); çà is a rare archaic adverb that survives only in the fixed phrase çà et là ("here and there"). All three are pronounced /sa/. Tests: sa can be replaced by ma/ta; ça can be replaced by cela.
Explanation
Sa, ça, and çà are three written forms sharing the sound /sa/, and the first two are extremely common — which makes them one of the most frequent spelling confusions in written French. Sa is a possessive adjective; ça is a demonstrative pronoun; çà is a fossilized adverb that modern French keeps alive in exactly one expression.
Sa is the feminine singular form of the possessive adjective meaning "his" or "her" (gender in French possessives agrees with the noun possessed, not with the owner). It always sits directly before a feminine singular noun: sa maison ("his/her house"), sa sœur ("his/her sister"), sa voiture ("his/her car"). It belongs to the same paradigm as mon/ma ("my") and ton/ta ("your"), so the substitution test is to swap in ma or ta: sa maison → ma maison / ta maison both work, confirming sa is a possessive.
Ça is the everyday, informal contraction of cela, a demonstrative pronoun meaning "that" or, more loosely, "it." It stands on its own as a subject or object, never directly in front of a noun it modifies: ça va ? ("how's it going?"), ça m'énerve ("that annoys me"), j'aime ça ("I like that"). The test here is to replace it with cela: ça m'énerve → cela m'énerve is grammatically identical (only more formal), confirming ça.
Çà, with a grave accent, is a genuine word but an extremely marginal one in contemporary French: historically an adverb of place meaning roughly "here," it has been almost entirely displaced by ici. The only place a learner will reliably meet it today is the fixed idiom çà et là, "here and there" (des papiers traînaient çà et là sur le bureau). Outside that one phrase, çà essentially does not occur, so if a spellchecker or a text suggests çà anywhere else, it is very likely a typo for ça.
Because sa always precedes a noun and ça never does (it replaces one), a quick structural check resolves most cases even before running the substitution test: look at what comes right after the word. If a feminine noun follows directly, you are almost certainly looking at sa; if the word stands alone, functioning as the whole subject or object, it is ça.
In short: sa is the possessive "his/her" before a feminine noun (test: ma/ta), ça is the pronoun "that/it" standing alone (test: cela), and çà is an archaism confined to çà et là. Confusing sa and ça is one of the most common French spelling mistakes even among native writers, precisely because both are so frequent and sound identical.
Examples
Sa maison est plus grande que la mienne. — His/her house is bigger than mine. (sa: feminine possessive before the noun maison, replaceable by ma/ta.)
Ça va, merci, et toi ? — I'm fine, thanks, and you? (ça: pronoun standing alone as subject, replaceable by cela.)
Sa voiture est en panne, et ça m'énerve beaucoup. — His/her car has broken down, and that really annoys me. (Direct contrast: sa (before voiture) vs ça (standing alone).)
Des feuilles mortes s'éparpillaient çà et là dans le jardin. — Dead leaves were scattered here and there in the garden. (çà: archaic adverb, occurs only in the fixed phrase çà et là.)
J'aime bien sa façon de raconter ça. — I really like his/her way of telling that. (sa façon (possessive + noun) vs ça (pronoun, object of raconter).)
Common mistakes
Ça voiture est en panne, sa m'énerve.
Sa voiture est en panne, ça m'énerve.
« sa » and « ça » are both pronounced /sa/, but « sa » is the feminine singular possessive adjective ("his/her," always followed by a feminine noun: sa voiture) and « ça » is the informal pronoun meaning "that/it" (short for cela: ça m'énerve). Test: try replacing the word with ma or ta — if that works, it is sa; try replacing it with cela — if that works, it is ça. In « Ça voiture », the word sits before the noun voiture and shows possession, so it must be sa: Sa voiture. In « sa m'énerve », the word stands alone as the subject of énerve and means "that," so it must be ça: Ça m'énerve.
Related rules
homophonesspellingpossessivespronouns