el
singular, masculine definite article
la
singular, feminine definite article
los
plural, masculine definite article
las
plural, feminine definite article
-s
plural form of a noun ending in a vowel
-es
plural form of a noun ending in a consonant
un
singular, masculine indefinite article
una
singular, feminine indefinite article
unos
plural, masculine indefinite article
unas
plural, feminine indefinite article