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Adjectives are words that describe or tell about nouns. Adjectives in Spanish must agree with the nouns they describe as far as gender and number (singular or plural).
Many adjectives have both a masculine and feminine form. Some have the same form for both the masuline and feminine.
Most adjectives ending in "o" change to "a" in the feminine. They add an "s" to both to form the plural.
Adjectives that end in "e" are the same for both the masculine and feminine. They add "s" to form the plural.
Adjectives that end in a consonant have the same form whether masculine or feminine. They form the plural by adding "es". The exception is some nationalities that end in a consonant but then add an "a" in the plural and "es" in the plural for both masculine and feminine.
Adjectives ending in "or", "án", "ón", or "ín" also have a feminine form by adding an "a". Those ending in "erior" don't have a feminine form.
Adjectives usually come after the noun if they tell what something is like or describe the noun. They usually come before the noun if they tell how many of something there are - a number or adjective that denotes amount.
To compare two adjectives the user should use más + adjective + que if the subject is greater in the comparison.
To compare two adjectives with the subject being less than, use menos + adjective + que.
With numbers one uses the preposition "de" rather than "que"
Tengo más de diez zapatos. - I have more than ten shoes.
The exception is in the negative because this implies the sense of only.
No tengo más que cinco camisas. - I only have five shirts.
When comparing two things that are the same one uses tan + adjective + como
El nino es tan alto como la nina. - The boy is as tall as the girl.
When comparing nouns the word "tanto" behaves almost like an adjective in this form:
tanto, tanta, tantos, tantas + noun + como
Maria da tanto tiempo como Carla. - Maria gives as much time as Carla.