ὅτι ἂν [1verse](pron sg neut nom/acc) (partic) "Whatever" is a special construction, ὅτι an, that means "that possibly." "whoever" "whatever," or "who if any."  It combines the demonstrative pronoun (hostis) with the particle of possibility (an). 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, meaning "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 the possibilities that need not be translated in English.