There are very few adjectives with 2 forms: short, before a noun begining with a vowel, and another often bigger, to put after the noun.

And it is for masculine, singular.

I see 3 cases:

• beau / bel
• vieux / vieil
• nouveau / nouvel

There are very few adjectives with 2 forms: short, before a noun begining with a vowel, and another often bigger, to put after the noun.

And it is for masculine, singular.

I see 4 cases (with help of M. Glisse):

• beau / bel
• vieux / vieil
• nouveau / nouvel
• fou / fol