Definite and Indefinite Articles

Articles

Words that come before nouns to show whether you are talking about something specific or something more general

Definite article

You are talking about a specific noun — something known or identified (the dog in my yard is barking)

Indefinite noun

refers to any one of something, not a specific one — more general or unknown (a cat, a book)

El (definite articles)

Masculine, singular

La (definite articles)

Feminine, singular

Los (definite articles)

Masculine, plural

Las (definite articles)

Feminine, singular

Un (indefinite articles)

Masculine, singular (a)

Una (indefinite articles)

Feminine, singular (a)

Unos (indefinite articles)

Masculine, plural (some/a few)

Unas (indefinite articles)

Feminine, plural (some/a few)

Exception

Some nouns may be masculine and feminine despite ending in -o or -a

Infinitives

The base form of a verb, before it’s changed to match a subject or tense.  In Spanish, all infinitive verbs end in one of three endings: -ar, -er, or -ir. In addition, ser, estar, tener, and ir are all infinitive forms of verbs.