There are lots of adjectives that refer to nationalities and places of origin which end in -s.
They form their plurals this way:
add -es (masculine plural)
add -as (feminine plural)
Take for example adjective francés (French)add -as (feminine plural)
Un hombre francés
A French man
Dos hombres franceses
Two French men
Dos mujeres francesas
Two French women
Notice how the plural does not have an accent.
Have a look and listen to these examples:In Spanish this type of adjectives are not capitalised.
Soy Español.
Soy español.
I am Spanish.
Son Españoles.
Son españoles.
They are Spanish.
See also Forming the singular feminine of -s ending nationality and place of origin adjectives
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