Use prepositions 

What's a preposition?  It's a word that starting a describing phrase in your sentence. Those describing phrases will typically include the preposition, a noun, and maybe an adjective or two.  E.g., over the hill, through the woods, to grandmother's house, on the desk, in the drawer, under the table. The prepositions here are over, through, to, on, in and under.

In this lesson, we're going to look at six prepositions - a, endecon, por and para.

Use to mean at or to.                                                                                                  

     I'm going to class.
     Voy a clase.

     La clase es a las dos.
     The class is at two.

 a forms a contraction with el (the).

 a + el = al

     English: I'm going to school
     WrongVoy a el colegio
     Right: Voy al colegio 

Use en to mean in or on.  

You'll use en for even more in Spanish, because in Spanish you won't say you're at a place. You always say you're in a place.

     I'm at home.
     Estoy en casa.

     I'm at school.
     Estoy en el colegio. (or, en la escuela)

Use the word de when you want to say of or from. 

You'll also use de instead of possessive apostrophes.  
I'll explain.  When you say you're going to your grandmother's house, or going to your friend's birthday party, 
you won't use person-apostrophe-s, like you do in English.  (e.g. David's car)

Instead, you say thing (car/party/house) of person (David/friend/grandmother).

     David's car
     el carro de David

     my grandmother's house
     la casa de mi abuela

     my friend's party
     la fiesta de mi amigo

 de forms a contraction with el (the).

 de + el = al

     English: the man's car
     Wrongel carro de el hombre          Right: el carro del hombre

What about the person with whom you're going?  Use the preposition with - con.

     I'm going with my brother.
     Voy con mi hermano.

If you're saying with me or with you, you use compound words made from con:

     with me

     with you

Every other use of con is normal:

     con usted        with you (polite)
     con él                with him
     con ella             with her
     con nosotros / nosotras             with us
     con vosotros / vosotras             with y'all
     con ustedes                                  with y'all (polite, or Latin American)
     con ellos / ellas                             with them

Por may be the most useful word in Spanish. It can mean for, by, per, through, and because of.

     Gracias por el regalo.
     Thanks for the present.

     Cinco dólares por el sándwich.
     Five dollars for the sandwich.

     Camino por el parque.
     I walk through the park.

     Hablo por teléfono.
     I talk by phone.

Para usually means in order to, and for (somebody).  There are a couple of other uses we'll cover later.

     The present is for you.
     El regalo es para ti.

     In order to get an 'A', you have to study.
     Para sacar una 'A', tienes que estudiar.


a = at, to

con = with

de = from, of

en = in, on

para = for, in order to

por = for, by, through