Prepositions:
* For: Used to indicate purpose, reason, or benefit.
* By: Used to indicate the agent or means of an action.
* Through: Used to indicate movement or passage.
* Per: Used to indicate a rate or proportion.
* Because of: Used to indicate cause or reason.
Other:
* Worth: Used to express value or importance.
* About: Used to indicate a topic or subject.
Examples:
* "Voy por el libro." (I am going for the book.)
* "El libro fue escrito por un famoso autor." (The book was written by a famous author.)
* "Camina por el bosque." (He walks through the forest.)
* "Pagamos $10 por persona." (We pay $10 per person.)
* "No puede salir por la lluvia." (He can't go out because of the rain.)
* "Ese cuadro vale por un millón de dólares." (That painting is worth a million dollars.)
* "Hablaré por teléfono." (I will talk about it on the phone.)
To understand the correct translation of "por," you need to look at the context of the sentence and the surrounding words.