 whichever decision they make, the concept of responsibility is raised repeatedly by both sides of the argument. 복합 관계 형용사- 부사절
 i’m going to buy an mp3 player, whatever it costs. 복합관계대명사- 부사절
 whoever directed this film, it is no good. 관계복합대명사 - 부사절
cf. no matter what problem you have, you can always come to me for help. (=whatever) 관계복합형용사-부사절