The rule that has no English equivalent is that individual names are accompanied by singular adjectives and plural nouns are accompanied by plural adjectives. Male names are described or limited by male adjectives, and female names are described or limited by female adjectives. A taco es una preparacién mexicana que en su forma esténdar consists of a tortilla containing algen foodo dentro. (A taco is a Mexican formula that, in its standard form, consists of a tortilla containing some food. Su is a determining or possessive adjective that changes with number, but not with sex. Essindar is an immutable adjective – the same word would have been used with plural or masculine subtantifs.) The same rule applies to certain articles (the equivalent of “die”) and unspecified articles (a class of words that contains “a,” “an” and “any”), which are sometimes considered adjectiveswww.thoughtco.com/noun-adjective-agreement-3078114. There are some adjectives that are known as variable adjectives that do not change in shape. Most of them are either unusual colors or words of foreign origin. An example is web ace in the web pegina (the website) and read web peginas (web pages). Sometimes a name can be used as an immutable adjective, but this practice is much less common in Spanish than in English. Being a Spanish student will rarely have the need to use immutable adjectives, but you should be aware that they exist so that they don`t confuse you when you see them. El hombre feliz goes an ascender al pico rocoso. (The happy man will climb the rocky summit.) The singular Feliz is used because there is only one man.
The male Rocoso is used because Pico is male. El is a male article. Al is a contractual form of more el. The noun adjective agreement is one of the most fundamental aspects of Spanish grammar: adjectives must correspond to the noun to which they refer in both numbers and sex. Adjectives can come before or after nouns, or they can be used with verbs such as ser (“being”) to describe names. But (with the exception of invariable adjectives), they will always be in tune with the nouns they describe in both numbers and genders. The “normal” form of adjectives, the form you will find in dictionaries is singular and masculine. To make the plural adjective, follow one of these steps that are considered to be the same as for the production of substantiveplural: Ha sido un d`a largo entre muchas semanas largas. (It was a long day between many long weeks.) The singular male largo is used with d`a, because d`a is a man and there is one, but the female pluralistic larga is used with Semanas, because Semana is female and there is more than one. Muchas are indeterminate male or female items.