Avoiding Hiatus in French
General Principle
French generally seeks to avoid the meeting of two consecutive vowel sounds. This phenomenon is called a hiatus.
To make pronunciation smoother and more fluid, French uses several mechanisms:
- elision;
- liaison;
- special forms of determiners;
- the appearance of semivowels (glides);
- certain spelling changes.
The goal is always the same:
to facilitate the transition between sounds and avoid a clash between two vowels.
Summary Table
| Situation | Theoretical Form | Actual Form | Mechanism |
|---|---|---|---|
| Pronoun + vowel | je habite | j’habite | Elision |
| Article + vowel | le ami | l’ami | Elision |
| Article + silent H | le homme | l’homme | Elision |
| Demonstrative + vowel | ce arbre | cet arbre | Form change |
| Feminine possessive + vowel | ma amie | mon amie | Form change |
| Si + il | si il | s’il | Contraction |
| Plural determiner + vowel | les amis | les amis (pronounced lay-zah-mee) | Liaison |
| Verb voir | voi-ons | voyons | Semivowel insertion |
| Verb étudier | étudi-ons | étudions | Semivowel insertion |
| Verb envoyer | envoi-ons | envoyons | Semivowel insertion |
1. Elision
Definition
Elision consists of dropping a final vowel before a word beginning with a vowel or a silent H.
Examples
| Full Form | Actual Form |
|---|---|
| je aime | j’aime |
| je habite | j’habite |
| le ami | l’ami |
| la école | l’école |
| ce est | c’est |
| ne est pas | n’est pas |
| de accord | d’accord |
| que elle | qu’elle |
Words That Commonly Undergo Elision
- je → j’
- le → l’
- la → l’
- ce → c’
- ne → n’
- de → d’
- que → qu’
2. Silent H and Aspirated H
Silent H (H muet)
The H is not pronounced and does not block elision.
Therefore, elision takes place.
Examples
- l’homme
- l’hôtel
- l’habitude
- j’habite
- l’histoire
Aspirated H (H aspiré)
The H is still not pronounced, but it blocks elision and liaison.
Examples
- le héros
- le haricot
- la honte
- le hasard
- le hibou
We say:
✅ le héros
❌ l’héros
3. Possessive Adjectives Before a Vowel
To avoid hiatus, feminine possessive adjectives change form before a vowel.
| Before a Consonant | Before a Vowel |
|---|---|
| ma sœur | mon amie |
| ma voiture | mon auto |
| ta sœur | ton amie |
| sa sœur | son ancienne collègue |
The noun remains feminine.
The change exists solely to facilitate pronunciation.
4. Demonstrative Adjectives
| Before a Consonant | Before a Vowel |
|---|---|
| ce livre | cet arbre |
| ce garçon | cet étudiant |
| ce musée | cet hôtel |
The form cet prevents the awkward sequence between ce and a following vowel.
5. The Contraction “s’il”
French avoids:
❌ si il
and instead uses:
✅ s’il
Examples:
- s’il vient
- s’il pleut
- s’ils arrivent
6. Liaison
Liaison creates an intermediate sound between two words.
Examples
| Spelling | Pronunciation |
|---|---|
| les amis | lay-zah-mee |
| un ami | un-nah-mee |
| nous avons | noo-zavon |
| ils arrivent | eel-zariv |
The liaison consonant acts as a bridge between two vowel sounds.
7. Semivowels (Glides)
French often transforms a vowel into a semivowel.
The Three Main French Semivowels
| Symbol | Example |
|---|---|
| [j] | bien, pied, voyons |
| [w] | oui, moi, loi |
| [ɥ] | lui, nuit, huit |
These sounds help avoid or soften hiatus.
8. The Case of “voir”: nous voyons
Why do we write “voyons”?
One could theoretically imagine:
- voi + ons
The succession of vowels would be less natural.
French instead introduces the semivowel [j], represented by the letter y.
This produces:
- nous voyons
- vous voyez
Pronunciation:
- vo-yons
- vo-yez
The letter Y functions as a transition between vowels.
9. Other Similar Verbs
| Infinitive | Conjugated Form |
|---|---|
| voir | nous voyons |
| envoyer | nous envoyons |
| nettoyer | nous nettoyons |
| employer | nous employons |
In all these cases, the semivowel [j] facilitates pronunciation.
10. Verbs Ending in -ier
Examples:
- étudier → nous étudions
- oublier → nous oublions
- marier → nous marions
- crier → nous crions
The letter i is pronounced as the semivowel [j].
For example:
- nous étudions → ay-too-dee-yon
- nous crions → cree-yon
The hiatus is therefore greatly reduced.
Exceptions: When French Accepts Hiatus
French does not always eliminate the meeting of two vowels.
Certain words deliberately preserve a hiatus.
1. Words of Learned or Classical Origin
- créer
- réagir
- réélire
- réorganiser
- coopérer
- aérodrome
Pronunciation:
- cré-er
- ré-a-gir
- ré-é-lire
The vowels belong to separate syllables.
2. Words with a Diaeresis (Tréma)
The diaeresis explicitly indicates that two vowels must be pronounced separately.
Examples
| Word | Approximate Pronunciation |
|---|---|
| Noël | No-el |
| naïf | na-eef |
| haïr | ha-eer |
| maïs | ma-ees |
| aiguë | ay-goo-uh |
The diaeresis is a graphic marker of hiatus.
3. Certain Common Words
- chaos
- cacao
- poète
- poésie
- océan
- lion
In these words, the succession of vowel sounds is accepted.
4. Prefixes Such as ré-, pré-, co-
Hiatus is often preserved in order to maintain the structure and meaning of the word.
Examples
- réécrire
- réouvrir
- réorganiser
- réajuster
- coopérer
- coédition
What You Should Remember
French does not completely forbid hiatus, but it has a strong tendency to avoid it.
To do so, it uses:
- Elision: j’aime, l’école;
- Special forms: mon amie, cet arbre;
- Contractions: s’il;
- Liaison: les amis;
- Semivowels (glides): voyons, étudions.
However, some words deliberately preserve hiatus, especially:
- words with a diaeresis (Noël, maïs, haïr);
- words formed with certain prefixes (réécrire, réagir);
- words whose historical development has preserved separate vowels (poésie, chaos, océan).
The rule can therefore be summarized as follows:
French generally prefers to avoid hiatus, but it accepts it when it is necessary to distinguish syllables, preserve meaning, or respect the historical structure of a word.
