1. Adjectives of Different Classes:
* If adjectives belong to different classes (e.g., opinion and color), they are usually separated by a comma.
* Example: "un beau, grand château" (a beautiful, large castle)
2. Adjectives of the Same Class:
* If adjectives belong to the same class (e.g., two colors), they are usually NOT separated by a comma.
* Example: "une robe bleu foncé" (a dark blue dress)
3. Exceptions:
* Short Adjectives: Even if adjectives belong to the same class, they are sometimes separated by a comma if they are short and common, especially if they are descriptive and emphasize the noun.
* Example: "un grand, beau parc" (a large, beautiful park)
* Emphasis: Sometimes, a comma is used to emphasize a particular adjective, even if it's not strictly necessary.
Important Notes:
* The rule of thumb is to use a comma if it improves the clarity and readability of the sentence.
* Context and personal style also play a role in the use of commas between adjectives.
Remember, it's always a good idea to consult a grammar book or a French language expert if you're unsure.