because - porque
for - porque
because of - debido a
since - puesto que
as - puesto que
due to / owing to - debido a

because - porque

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• The baby is crying because he is hungry.
  El bebé está llorando porque tiene hambre.
• They want to come because they want to see me.
  Ellos quieren venir porque quieren verme.

for - porque

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• We'll have to stay home, for it is raining outside.
  Tendremos que quedarnos en casa porque está lloviendo afuera.
• She turned on the lights, for she was afraid of the dark.
  Encendió las luces porque tenía miedo a la oscuridad.

because of - debido a

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• They stayed in because of the bad weather.
  Ellos se quedaron en casa debido al mal tiempo.
• She can not play sports because of her illness.
  Ella no puede hacer deportes debido a su enfermedad.

since - puesto que, ya que

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• He won't understand, since he doesn't speak English.
  No entender á, puesto que no habla inglés.
• They decided to go to sleep, since it was very late.
  Decidieron irse a dormir, puesto que era muy tarde.

as - puesto que, ya que

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• She failed to pass the exam, as she made many mistakes.
  No pudo pasar el examen, puesto que cometió muchos errores.
• They couldn't find us, as they didn't have our address.
  No pudieron encontrarnos, ya que no tenían nuestra dirección.

due to / owing to - debido a

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• The unemployment was high due to the economic crisis.
  El desempleo era alto debido a la crisis económica.
• They had a delay owing to the traffic jam.
  Tuvieron una demora debido al embotellamiento de tráfico.