****Por**** 1. Expressing movement along, trajectory, through, around, by or about: Camine por el parque. ( I walked through the park.) El se cayo por las escaleras. ( He fell down the stairs.) Sal por aqui. ( Go out this way.) Fuimos por el camino mas largo. ( We took the lounger route.) El bus 40 va por Lenox Rd? (Does the bus 40 go along Lenox Rd?) 2. Denoting time or duration: Navegaremos por cinco dias. ( We will sail for five days.) El hablo por una hora. ( He spoke for one hour.) Eso es suficiente por ahora. ( That's enough for now.) Estare lejos por una semana. ( I'll be away for one week.) 3. Expressing the cause not the purpose of an action/giving reasons: No fui a la escuela por el. ( I didn't go to school cause of him.) Si no fuera por Sophia no estariamos ahora aqui. ( If it weren't for Sophia, we were not here now.) 4. Meaning Per: Tres blusas por $50. ( Three blouses for $50.) 5. Supporting or in favor of: Trabajamos for la comunidad. ( We work for the Community.) Escribi este articulo por(en favor de)los derechos humanos.(I wrote this book for the human rights. 6. In exchange of: Compre esta falda por/en $60. ( I bought this skirt for $60.) Su esposa firmo por el. (His wife signed for him.) Yo puedo ir por ti. ( I can go for you or in your place.) Podrias pasar por Italiana. ( You could pass as Italian woman.) No haria eso por nada en el mundo. ( I wouldn't do so for anything in the world.) 7. Result: Ella es famosa por su belleza. ( She is famous for her beauty.) 8 Purpose: Te lo digo por tu bien. ( I'm telling you for your own good.) Eso es hablar por hablar ( That is talk ing for the sake of talking.) Lucharon porque se hiciera justicia. (They fought for justice to be done.) These are just some examples :) Remember to think in the meaning of what you want to express. It is not so hard :) Good luck.

For understanding which preposition to use (por or para) you need to think in the meaning you want to convey. por/para-for Para 1. For the purpose of/ in order to: Para tocar piano bien necesitas practicar.(In order to play well the piano, you need to practice) Para que es esto? ( What is this for?) Es para decorar la casa. ( It's for decoration of the house) 2. Use: Esta cobija es para tu cama. ( This cover is for your bed.) Este vestido es para la graduacion ( This dress is to wear is in the graduation) 3. For the benefit of / directed to: El libro es para ella. ( The book is for her. ) Esta agua no es para beber. ( This water is not for drinking.) 4. to/in the direction of when referring to specific place: Voy para tu casa. ( Im going to your house) Espero el avion para New York. ( I wait for the plane for NY) Vamos para California ( We are going to California) *In this cases going to you can use other prepositions such: Vamos *a* California. 5. by/for when referring a specific time: Necesito el libro para manana. ( I need the book for tomorrow) 6. Intended for: Escribi una carta para el. ( I wrote a letter for him.) Este presente es para ella. ( This gift is for her.) Prepare esta comida para ti. ( I prepared this dinner for you.)

por cantidades - por cuanto tiempo - para objetivos - para cuando terminare -

para: se usa para indicar un DESTINO Escribo esta carta para tí. Por: se usa como A TRAVÉS DE, o como MEDIO O CAUSA, Búscalo por allá. hazlo por mí

Maybe Jose you can explaın ıt better ın Catalan. Just to have some fun :D