beau / nouveau / vieux

Irregular Feminine Forms

Level 1

The adjectives beau (beautiful), nouveau (new), and vieux (old) have a special third form (bel, nouvel, vieil) used only when the immediately following masculine singular word starts with a vowel or a mute H.

How It Works

While most French adjectives have standard masculine and feminine forms, a small group of common adjectives has three distinct singular forms to ensure smooth pronunciation.

1. The Three Singular Forms:

  • Beau (Beautiful): beau (m), bel (m + vowel), belle (f)
  • Nouveau (New): nouveau (m), nouvel (m + vowel), nouvelle (f)
  • Vieux (Old): vieux (m), vieil (m + vowel), vieille (f)
  • Fou (Crazy): fou (m), fol (m + vowel), folle (f)
  • Mou (Soft): mou (m), mol (m + vowel), molle (f)

2. When to use the 'Special' Masculine Form:
You must use bel, nouvel, vieil, fol, and mol when the following conditions are met:

  • The noun being described is masculine singular.
  • The adjective is placed before the noun.
  • The immediately following word (whether it is the noun itself or another adjective) starts with a vowel (a, e, i, o, u, y) or a mute H (e.g., un bel homme, un bel ancien élève). If a consonant starts the next word, use the standard form (e.g., un beau petit oiseau).
  • Important: If the adjective is placed after the noun, it remains in its standard form even if the next word starts with a vowel (e.g., un homme beau et intelligent). Also, if the word starts with an aspirated H (like héros) or certain 'y' words (like yacht), you must use the standard form: un beau héros, un beau yacht.

Pronunciation Tip: These special masculine forms (bel, nouvel, vieil, fol, mol) are pronounced exactly the same as their feminine counterparts (belle, nouvelle, vieille, folle, molle)! This phonetic logic is the same one used for demonstrative adjectives (changing ce to cet before a vowel).

3. Plural Forms:
In the plural, the special masculine singular forms are not used. Masculine nouns use the standard plural forms: beaux, nouveaux, vieux, fous, and mous. Note the spelling rules: beau and nouveau take an -x, vieux does not change because it already ends in -x, and fou and mou take a standard -s. Feminine nouns always use their own plural forms: belles, nouvelles, vieilles, folles, and molles. The liaison created by the plural 'x' or 's' (e.g., beaux arbres) makes the special singular form unnecessary.

4. Placement and Rarity:
Beau, nouveau, and vieux are BAGS adjectives, meaning they usually precede the noun. If you place them after the verb to describe a subject, you must use the standard form (e.g., L'homme est beau, not bel). However, fou and mou are not BAGS adjectives and almost always follow the noun. Because of this, you will rarely need to use their special forms fol and mol in everyday speech, as they are mostly restricted to literary contexts or fixed expressions.

Examples (6)

  1. C'est un bel appartement.

    It is a beautiful apartment.

    Word by Word: It is a beautiful apartment.

    'Appartement' is masculine and starts with a vowel, so 'beau' becomes 'bel'.

  2. Il a un nouvel ordinateur.

    He has a new computer.

    Word by Word: He has a new computer.

    'Ordinateur' is masculine and starts with a vowel, so 'nouveau' becomes 'nouvel'.

  3. C'est un vieil homme.

    He is an old man.

    Word by Word: It is an old man.

    'Homme' starts with a mute H, which acts like a vowel, so 'vieux' becomes 'vieil'.

  4. C'est un beau héros.

    He is a handsome hero.

    Word by Word: It is a beautiful hero.

    'Héros' starts with an aspirated H, so we use the standard masculine form 'beau' instead of 'bel'.

  5. J'aime ce beau jardin.

    I like this beautiful garden.

    Word by Word: I like this beautiful garden.

    'Jardin' starts with a consonant, so the standard masculine form 'beau' is used.

  6. Voici ma nouvelle voiture.

    Here is my new car.

    Word by Word: Here is my new car.

    'Voiture' is feminine, so we use the standard feminine form 'nouvelle'.

Common Mistakes

  • Using the special form when the adjective is not directly before the noun.

    Cet homme est bel.
    Cet homme est beau.

    The forms 'bel', 'nouvel', and 'vieil' are only used when the adjective immediately precedes the noun. If it comes after a verb like 'être', use the standard masculine form.

  • Confusing 'bel' with the feminine 'belle'.

    C'est une bel femme.
    C'est une belle femme.

    Although 'bel' and 'belle' sound the same, 'bel' is strictly masculine. Use 'belle' for feminine nouns regardless of the starting letter.

  • Using the special masculine form in the plural.

    Ce sont de vieils amis.
    Ce sont de vieux amis.

    The special forms are only for singular masculine nouns. In the plural, the 'x' or 's' already allows for a liaison sound (e.g., 'vieux amis' sounds like 'vieu-z-amis'), so the special form is not needed.

How It Connects

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beau / nouveau / vieuxLevel 1Irregular Feminine Forms

Learn This First

To learn these irregular adjectives, you first need to understand the general rule of adjective agreement in French. Additionally, familiarity with how French handles vowel clashes (elision) helps explain why these adjectives have a third 'special' masculine form used before vowel-initial nouns.

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nouveauvieux