Because my family is not rich. I have to work to earn money for their parents because I don't know what I want when I die. I would like to respond to his benefactor, origin and fed me.
Because my family was not wealthy I need to work for my parents. Because I do not know if I have to die now, I would return the favor when you give birth and raise me.
Because my family is rich. I have to make money to his parents. Because I don't know if I die when where and when, I will repay you give birth and raised me.