ὃς ἂν  [36 verses](pron sg masc nom)(partic) "Whatever" is a special construction, hos an, that means "that possibly." "whoever" "whatever," or "who if any."  It combines the relative pronoun (hos) or the demonstrative pronoun (hostis) with the particle of possibility (an) or the conjunction meaning "when."  The literal sense is "this one might." Together, they begin a relative, conditional clause that refers to each individual. If takes a subjective verb like an "if/when" phrase.  -- "Whoever" is from a special construction connecting a pronoun with a conditional particle or conjunction that together mean "whatever" or "whoever." Together, they begin a relative, conditional clause that refers to each individual person or thing. The verb form required in Greek is one of possibilities.