Before a noun, "tout" agrees in gender and number: tout (m.s.), toute (f.s.), tous (m.p.), toutes (f.p.). Before a feminine adjective beginning with a consonant, "toute" agrees. Before a vowel, "tout" is an adverb and stays unchanged.
Before a noun, make it agree. Before an adjective, check whether it is an adverb (meaning "très", very).
Examples
Tous les enfants sont là.
Key word(s): tous
Before "enfants" (masculine plural).
Elle est tout émue.
Key word(s): tout
An adverb before a feminine adjective beginning with a vowel, so it stays unchanged.
Elles sont toutes contentes.
Key word(s): toutes
Before a feminine adjective beginning with a consonant, so it agrees.
Toute la classe a compris.
Key word(s): toute
Before "classe" (feminine singular).
Tout le monde est venu.
Key word(s): tout
Before "monde" (masculine singular).
Common mistakes
Writing "toute émue" (a pointless agreement before a vowel)
Writing "tout contentes" (forgetting the agreement before a consonant)
Confusing "tous" and "tout" before a masculine plural noun
Test yourself
___ les filles sont venues.
Before "filles" (feminine plural).
Elle est ___ heureuse.
Before a feminine adjective beginning with a silent "h" (treated as a consonant), so it agrees.
___ le village fête l'événement.
Before "village" (masculine singular).
Tips to remember
Before a noun, the agreement is simple: gender plus number of the noun.
Before an adjective, "tout" is an adverb meaning "très" (very). Exception: it agrees in the feminine before a consonant.
"Tous" is pronounced "touss" when it is a pronoun ("ils sont tous là") and "tou" before a noun.
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