Look at these examples:
Il y a un petit chat et une petite souris.
There is a small cat and a small mouse.
Il est français et elle est française.
He is French and she is French.
Le joli garçon est avec la jolie fille.
The pretty boy is with the pretty girl.
Je mange un melon vert et une pomme verte.
I eat a green melon and a green apple.
Notice that the describing word/adjective (for example petit) changes according to whether the object it refers to is masculine (un chien) or feminine (une souris)
Petit is a regular adjective and takes an -e in the feminine form (petite).
This rule combines with:
Make most adjectives plural by adding -s
See also related lesson Adjectives ending with mute -e don't change in the feminine form
Learn more about these related French grammar topics
Examples and resources
Il y a un petit chat et une petite souris.
There is a small cat and a small mouse.
Le joli garçon est avec la jolie fille.
The pretty boy is with the pretty girl.
Il est français et elle est française.
He is French and she is French.
Je mange un melon vert et une pomme verte.
I eat a green melon and a green apple.

Q&A

Ron
Kwiziq community member
9/09/17
Thank you for your question regarding feminine formation of adjectives. I am somewhat unclear what types of problems you are having since none were specified.
Please consider re-posting you question with more precise examples of the problems that you are encountering.
Bonne chance et bonne continuation
Vlad
Kwiziq community member
28/12/17
Stuart
Kwiziq community member
6 December 2017
1 reply
Are there any obvious (common) adjectives that are exceptions?
Gruff
Kwiziq language super star
6 December 2017
6/12/17
Hi Stuart, yes there are lots of exceptions and special rules for adjective agreement. You can browse a list of all our lesson on these here: https://french.kwiziq.com/revision/glossary/lexical-category-or-parts-of-speech/adjective