What are the rules for French declensions?

French declensions refer to the changes in the form of nouns, adjectives, and articles based on their grammatical role in a sentence. In French, there are two main types of declensions: masculine and feminine. Nouns, adjectives, and articles must agree in gender and number. Masculine nouns and adjectives typically end in -eau, -age, or -isme, while feminine nouns and adjectives often end in -tion, -sion, or -t. Adjectives usually come after the noun they describe and must match in gender and number. Articles like le, la, les, and un, une also change based on the gender and number of the noun they precede.