1〉when used as an adjective: '本来' means ' original， genuine', ' 一关上门，他便露出了本来面目' (once behind the door, he behaved like who he really is); '原来' ——like the way or state that they have not been changed yet. For example: 把电视摆回原来的位置( move the television back to its previous position). 2〉: used as an adverb 本来——supposed to; 这本来就是你该干的！ This is supposed to be your job! 原来—— in an early time; that's why! that explains a lot! no wonder! *她看上去只有三十出头(she looks like just in her thirty sth) *她原来做过舞蹈演员(she was a dancer in the early age) *怪不得！原来如此！Oh I see, no wonder!