Definite articles (the) refer to a specific object (the apple or the pen). Check out a few examples:
Article - English
Article - Spanish
Noun - English
Noun - Spanish
masculine, singular
the
el
the pen
el bolígrafo
masculine, plural
the
los
the pens
los bolígrafos
feminine, singular
the
la
the apple
la manzana
feminine, plural
the
las
the apples
las manzanas
Indefinite Articles / Artículos indefinidos
Indefinite articles (a, an, some), on the other hand, refer to an unspecified object (an apple or a pen ).
Article - English
Article - Spanish
Noun - English
Noun - Spanish
masculine, singular
a, an
un
a pen
un bolígrafo
masculine, plural
some
unos
some pens
unos bolígrafos
feminine, singular
a, an
una
an apple
una manzana
feminine, plural
some
unas
some apples
unas manzanas
Subject Pronouns
I
yo
you
tú
he, she
él, ella
we
nosotros, nosotras
you (plural)
vosotros, vosotras
they
ellos, ellas
In English, we use subject pronouns to avoid confusion, since almost all forms of most verbs are the same (I go, you go, we go, they go, etc.) In Spanish, however, each conjugated verb form is unique and therefore reveals the subject. This means that, unless you're really trying to emphasize or clarify who you're talking about, the subject pronoun is usually pretty unnecessary and therefore taken out altogether. For example:
I go to the store.
Yovoy a la tienda.
Voy a la tienda
You go to the store.
Túvas a la tienda.
Vas a la tienda.
We go to the store.
Nosotrosvamos a la tienda.
Vamos a la tienda.
As you can see in the second column, the Spanish verb "ir" ("to go") conjugates differently depending on the subject. Therefore, it is not necessary to include the subject pronoun, which we have taken out in the third column.
Direct Object Pronouns
me
me
you
te
him/her
lo/la
us
nos
you (plural)
os
them
los, las
Direct object pronouns are used to replace the proper noun. For example:
Original Sentence
With Direct Object Pronoun
Sara washes the dishes.
Sara washes them.
Sara lava los platos .
Sara los lava.
In this sentence, just as "the dishes" has been replaced by "them" in the English version, "los platos" in the Spanish version has been replaced by the direct object pronoun "los."
Indirect Object Pronouns
to me
me
to you
te
to him, to her, to it
le
to us
nos
to you (plural)
os
to them
les
An indirect object is the person or thing for whom an action is being performed or has been performed. For example:
Carlos gives the present to him.
Carlos da el regalo a él .
Carlos le da el regalo.
In this sentence "to him" ("a él") has been replaced by the indirect object pronoun "le".