This due to the use of "why" and "because" in English to introduce explanations that are fundamentally different and grammatically differentiated in other languages. One is a cause, as in the antecedent cause of a consequent effect, while the other is a purpose, the effect desired prior to undertaking an action. This is the difference between etiology and teleology, which many students fail to grasp. "Why does man print this?" asks for a cause, while "Why are you using man in a test?" asks for a purpose.