Hey Karima, I shall provide you an explanation over the usage of ''because'' and ''for'', as having the same meaning. 1) First of all, you should know that "because" is your best choice for clear, correct, unambiguous communication, especially if you want to be understood easily by other non-native speakers. ''Because'' equals to ''for the reason that; due to the fact that.'' E.g.: ''He could not sleep last night because he was too worried about you.'' E.g.: ''I came because you asked me to.'' E.g.: ''I lost my job because of her.'' ***NOTICE: You use ''because'' with a reason clause when you are explaining a statement. E.g.: ''Because it's an area of outstanding natural beauty, you can't build on it.'' 2) Usage of ''for'' as having the meaning of ''because'' = "for" can be acceptable, although I would never expect to hear it in normal conversation. It would come across as overly-academic, or possibly epic or religious. E.g.: "We all shall be concerned, for we are the men upon which God called to live in this world.'' E.g.: ''Forgive me, Father, for I have sinned.'' E.g.: ''Mankind is blight to this earth, for we do nothing but destroy it.'' ***NOTICE: Consider using ''for'' when you want to be poetic and inspirational. Besides, in stories, ''for'' is sometimes used to mean 'because'. This use is rather old-fashioned, and is not used in conversation. For example: ''This is where he spent his free time, for he had nowhere else to go.'' Hope that helps!!! Should you have any further questions, do not hesitate to contact me.