For instance, “vous” has a silent “s”, unless it's something like “Je vous ai vu.” (I'm not sure that I constructed that properly, but you get the point — the s is pronounced in that case.)

But what if you have "Je voudrais acheter un billet."? Is it "voo-drez"?

Basically, I'm asking do you always pronounce it if the next word begins with a vowel, or only under certain circumstances?

  • It seems that is is quite discretional. My french teacher even disadvised to make the "liason" and in fact here (in the south) seems that people use it, but not too much.
    – Paolo
    Jun 11, 2012 at 9:38

4 Answers 4


A general rule: use whatever is the easiest to pronounce.

In the case of “Je vous ai vu”, I hope you will find [ʒə.vu.z‿e.vy] easier than [ʒə.vu.e.vy], because you would hardly be understood if you omit the liasion.

In “Je voudrais acheter un billet” it doesn't matter much. Personally I use a very light liaison (something between a /z/ and an aspirated /h/).

You will find more information on the Liaison (French) articles on Wikipedia.

  • 1
    By the way, why isn't it Je vous ai vus? Must not the past participle agree when a direct object proceeds it? Apr 19, 2016 at 21:39
  • 3
    @Aerovista: Vous can also be singular ;-) Apr 19, 2016 at 21:41
  • Oh, so it would be either, depending on context. Bien sûr. Merci. Apr 19, 2016 at 21:44

I would say that usually when you have a s (or x) before a vowel, you can make the liaison. This is in order to avoid hiatuses. Usually, it's intended to be easier to pronounce. But if you don't pronounce it, you will be understood anyway, don't worry for that.

Full official rules from l'Académie française here. There are mandatory liaisons, forbidden ones, and optional cases (if you do the liaison then, it would be considered as “un parlé soutenu”, more or less the equivalent of the 'formal' register in English).

(Another link that may help, in French here, or this one in English.)

A quite common mistake on the liaison (confusion between a 't' and a 's' of sometimes a 'n' sound) is called “pataquès”.

  • Is 'x' pronounced as a 'z'? I didn't know you could make liaisons with 'x'. Jun 12, 2012 at 5:41
  • 1
    « Je suis aux anges. » (idiom meaning "I'm euphoric") No liaison between suis aux but mandatory one between aux anges. French language is hard... Jun 12, 2012 at 7:30
  • 1
    yes @Aerovista, as 'z'
    – cedbeu
    Jun 12, 2012 at 11:44
  • 1
    @RomainVALERI I think the first one is optional here. In this case, not doing it maybe considered much more easy and euphonic indeed.
    – cedbeu
    Jun 12, 2012 at 11:50

I will add the particular case of nouns finishing by the letter "s" in their singular form: The classic rule says that if the "s" is pronounced in the singular form, then it is not pronounced in the plural form, so you must say "un os"[εnos] -> "des os"[dezo], "un ours"[εnurs] -> "des ours" [dezur], and that rule also explains why "moeurs" has to be pronounced [mɶr] and not [mɶrs].

  • 1
    J'ai toujours entendu (et dit) le s final au pluriel dans « des ours ». Une référence serait bienvenue.
    – Toto
    Mar 18, 2020 at 9:25
  • @Toto Même chose pour moi. Je crois avoir lu quelque part, peut-être dans le Journal de Julien Green, qu'André Gide avait adopté cette prononciation aberrante, /dezur/ pour "des ours". Il s'agit d'une affectation et je doute que cette pronociation sans /s/ ait jamais eu cours.
    – grandtout
    Mar 19, 2020 at 14:20

Un comédien de la Comédie-Française et professeur au conservatoire, Georges le Roy (Traité pratique de la diction française, Grancher, 1968 [1932], p. 23), sans évoquer les règles qui régissent les accords, pour lesquelles il renvoie à sa Grammaire de la diction française (1912), propose quelques exercices de diction consacrés aux liaisons, qu'il introduit simplement ainsi (nous soulignons) :

Ne pas faire assez de liaisons est blâmable et quelquefois vulgaire ; en trop faire est prétentieux et quelquefois dangereux. L'important est de se souvenir que la règle principale en cette matière est l'harmonie.

Puis il poursuit par une distinction qui répond à la question tout en précisant cette exigence de sagacité ainsi, disons-le, de bon goût, que doivent travailler ces exercices, afin de

1o. Distinguer les liaisons qu'il faut faire et celles qu'il faut éviter ;

2o. S'habituer, sur des cas où la liaison est permise, à lier légèrement et avec facilité.

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