French · Pronunciation Guide
lay va-KAHNSS — always plural in French, with a nasal vowel and a pronounced final "s".
les va-CANCES, weight on the final syllable. The "(f. pl.)" note is essential: this noun has no singular in this meaning, so it is always "les vacances" and always takes a plural verb.
Listen: les vacances (f. pl.)
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Bonnes vacances !
Have a good vacation!
Listen: Bonnes vacances !
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"Bonnes vacances !" uses the feminine plural "bonnes", agreeing with the noun. The "nn" keeps the vowel oral and the "n" real, so it is /bɔn/, unlike the nasal masculine "bon". This is the same farewell pattern as "bon week-end" and "bonne journée" — "bon" plus a time expression.
Learners use the singular, saying "la vacance", which either means a job vacancy or sounds simply wrong. It is always plural. Phonetically, the nasal gets a real "n" and the pronounced "s" gets dropped. And the adjective must agree in the feminine plural — "bon vacances" is a visible error.