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Just like articles, French adjectives also have to match the nouns that they modify in gender and plurality.
Regular formation
Spelling
Most adjective changes occur in the following manner:
- Feminine: add an -e to the masculine form
- un garçon intéressant --> une fille intéressante
 - un ami amusant --> une amie amusante
 - un camion lent --> une voiture lente
 
 - Plural: add an -s to the singular form
- un garçon intéressant --> des garçons intéressants
 - une fille intéressante --> des filles intéressantes
 
 
Pronunciation
Generally, the final consonant is pronounced only when it comes before an -e. Most adjectives, such as those above, are affected by this rule.
- Masculine Pronunciation: intéressan, amusan, len
 - Feminine Pronunciation: intéressant, amusant, lent
 
Irregular formation
Irregular plural formation
| Examples | |||||||
|---|---|---|---|---|---|---|---|
| M Sing. | --> | M. Pl. | Masc. Singular | --> | Masc. Plural | Notes | |
| No change | -s | -s | un plafond bas  un gros porc  | 
des plafonds bas  des gros porcs  | |||
| -x | -x | un homme généreux  un garçon furieux  | 
des hommes généreux  des garçons furieux  | ||||
| Add x | -eau | -eaux | un nouveau jeu | des nouveaux jeux | |||
| -al | -aux | un vent hivernal | des vents hivernaux | Exceptions: fatal (fatals),  final (finals) & naval (navals)  | |||
Irregular feminine formation
| Examples | |||||||
|---|---|---|---|---|---|---|---|
| Masc. | --> | Fem. | Masculine | --> | Feminine | Notes | |
| No change | -e | -e | égoïste, populaire, sociable, timide,  énergique, dynamique, sympathique  | 
* When the masc. form ends in an -e, there is no change.  * The final consonant is pronounced on the masc. form.  | |||
| Final  Consonant Doubled  | 
-el | -elle | cruel | cruelle | When an adjective has one of these endings, the ending of the feminine form is doubled. There is no change of pronunciation when changing from -el to -elle. -il is pronounced "ee" (as in keen), while -ille is similar, with a final yuh (pronounced like "ee" in keen with a "yuh" on the end: IPA /ij/). -on is pronounced oh(n) and -onne is pronounced ohn. -en is pronounced a(n) and -enne is pronounced ehn. -os is pronounced oh and -osse is pronounced ohs. -as is pronounced ah and -asse is pronounced ahs.  | ||
| -il | -ille | gentil | gentille | ||||
| -on | -onne | bon  breton  | 
bonne  bretonne  | ||||
| -en | -enne | ancien  parisien  | 
ancienne  parisienne  | ||||
| -os | -osse | gros | grosse | ||||
| -as | -asse | bas | basse | ||||
| -c  change  | 
-c | -che | blanc  franc  | 
blanche  franche  | 
|||
| -eur  change  | 
-eur | -euse | accrocheur  prometteur  | 
accrocheuse  prometteuse  | 
|||
| -eux  change  | 
-eux | -euse | furieux  généreux  | 
furieuse  généreuse  | 
-eux is pronounced ew (like dew) and -euse is pronounced ews. | ||
| -g  change  | 
-g | -gue | long  | 
longue  | 
|||
| -if  change  | 
-if | -ive | sportif  actif  | 
sportive  active  | 
|||
| er  change  | 
-er | -ère | étranger  cher  | 
étrangère  chère  | 
-er is pronounced ay and -ère is pronounced ehr, though exceptions such as "cher" exist in which both forms are pronounced with ehr. | ||
| -et  change  | 
-et | -ète | inquiet  complet  | 
inquiète  complète  | 
-et is pronounced ay and -ète is pronounced eht. | ||
| -ou  change  | 
-ou / -ol | -olle | fou, fol  mou, mol  | 
folle  molle  | 
-ol forms occur before a vowel or mute h. | ||
Special rules
Adjectives that precede nouns
List
Adjectives that are used frequently before nouns. These are:
- affreux (affreuse)
 - autre
 - beau (belle)
 - bon(ne) +
 - court(e) +
 - dernier (dernière) +
 - gentil (gentille)
 - grand(e) +
 - gros(se) +
 - haut(e)
 - jeune +
 - joli(e)
 - large
 - long(ue)
 - mauvais(e)
 - méchant(e) +
 - meilleur(e)
 - nouveau (nouvelle)
 - pauvre
 - petit(e)
 - vieux (vieille)
 - vilain(e)
 
+ sometimes placed after a noun, and may change in meaning
When these adjectives appear before an indefinite plural noun, they will change the article associated with it:[1]
- des garçons courageux / de beaux garçons
 
Changes in meaning
When "grand" goes before a noun, it means "great". However, when it goes after the noun, it means "tall".
Likewise, when "pauvre" goes before a noun, it means "unfortunate". When it comes after the noun, it means financially "poor".
This rule works most of the time, but be careful, "pauvre" can mean "financially poor" even when used before the nouns.
Beau, nouveau, and vieux
These three adjectives behave differently when placed before a singular masculine noun starting with a vowel or silent h:
| Masc. Sing. Cons. | Masc. Sing Vowel | Masc. Plural | Fem. Sing. (all) | Fem. Plural | |
|---|---|---|---|---|---|
| Beau | un beau garçon | un bel individu | de beaux garçons | une belle fillette | de belles fillettes | 
| Nouveau | un nouveau camion | un nouvel ordre | de nouveaux ordres | une nouvelle idée | de nouvelles idées | 
| Vieux | un vieux camion | un vieil ordre | de vieux camions | une vieille idée | de vieilles idées | 
Possessive adjectives
A possessive adjective tells us who owns/possesses something. So, you might say, "my house", "their family" or "his dogs". The same is done in French. However unlike English, in French we use different possessive adjectives dependent not only the person who owns the object (my car vs your car etc.) but also dependent on the gender and number. E.g. If I only have one dog, I would say, "mon chien" but if I have lots of dogs, I would say, "mes chiens".
Furthermore in English, we say "her car" when the owner of the car is a woman and "his car" when the owner is a man. In French, they say "sa voiture" even if the owner is a male. It is not the owner who determines the gender of the possessive adjective but the object owned. The following possessive adjectives are in the order of: masculine object, feminine object, plural (several of the object).
First person singular - mon, ma, mes
Second person singular (informal) - ton, ta, tes
Third person singular - son, sa, ses
First person plural - notre, notre, nos
Second person plural (and polite form) - votre, votre, vos
Third person plural - leur, leur, leurs
Note: Exception. When a feminine noun starts with a vowel or silent 'h', you should utilize "Mon" instead of "Ma". Example:
Mon ami = ok Ma amie = error! Mon amie = ok.
Demonstrative adjectives
Demonstrative adjectives identifies a specific object relative to the speaker. In English, demonstrative adjectives are words like, "this" and "these".
There are four adjectives that demonstrate a specific object in French:
- Ce garçon (masculine) - this/that boy
 - Cet ami (masculine before vowel or silent h) - this/that friend
 - Cette fille (feminine) - this/that girl
 - Ces enfants (plural) - these/those children
 
References
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