An explanation of how French adjectives should correspond to their nouns in terms of gender and plurality If the standard form of the adjective ends in s or x, the singular and plural masculine forms are the same. When colors are used as adjectives, they follow the general rule of French grammar to agree with the noun they describe. This general rule states that colors in French must correspond to different genders (woman / man) and numbers (singular / plural). There are four cases that apply to color matching in French: When it comes to color objects composed of two colors, color lenses in French are immutable. They do not correspond in number and gender with the name they describe: Well, it becomes obvious that it is too simple. Suppose you mean interesting movies and plays.