Adjectives--masculine and feminine singular

As you know, adjectives change their form depending on whether they describe a masculine or a feminine noun.

This means that you have to know two things:
*Is the noun masculine or feminine? (There's no easy way to know this; you need to memorize this.)
*What are the masculine and feminine forms of various adjectives? Again, you have to memorize these.

Adjectives whose masculine form ends in a consonant (all letters except a/e/i/o/u/y) have masculine and feminine forms.
--intelligent = masculine
--intelligente = feminine

Adjectives whose masculine form ends in a silent e do not change to make the feminine:
--sociable = masculine
--sociable = feminine

Examples of adjectives that have both masculine and feminine forms are: petit, grand, brun, blond, américain, français, amusant, patient, intelligent, intéressant.

Examples of adjectives that do not add an 'e' to make the feminine (because there already is one) are: sympathique, timide, énergique, égoïste, dynamique, populaire, sociable, enthousiaste.

Practice these making sure that you know which adjectives have two forms and which ones have only one form.