* The idea of because is expressed in a number of ways in Spanish. Preceding a conjugated verb, porque, puesto que, ya que, or como can be used.

Ya que es muy rico, no tiene que trabajar.
(Since he is very rich, he doesn’t have to work)

Ellos estudian porque no hay otra alternativa.
(They study, because there is no other alternative)

Como/Puesto que es muy estudioso, saca buenas notas en sus exámenes.
(Since he studies a lot, he gets good grades in his exams)

* Of these five expressions, only porque cannot be used to begin a sentence. When preceding a noun, always use por. This use corresponds to English because of .

Todos lo admiran por su entusiasmo.
(Everyone admires him because of his enthusiasm)