@PONKOM,
ponkom: "philosophy want to know what the world and man really is ,since science and religion can't give us the answer."
Hmm... who can give this answer? And are you so sure it is really a question worth asking?
People very often ask the wrong questions for the information they are after. Even a correct answer can be wrong if you're not asking the right question.
So how to decide what questions to ask?
As I see it we decide that ourselves. But it seems a bit strange that we are so eager to discover ultimate truths, and then we just dreamed up the premise, or the question. The answer relates to the question, so any answers capacity to be true is limited by the initial question.
That's why questions are ultimately useless in philosophy.
And also, philosophy has never found an answer to anything. It has made many answers though, as it has made many questions. Another interesting thing to find out is; what is left of philosophy when the answers and questions have all cancelled eachother out?