ean (Greek #1437)
a conditional particle; in case that, provided, etc.; often used in connection with other particles to denote indefiniteness or uncertainty
KJV usage: before, but, except, (and) if, (if) so, (what-, whither-)soever, though, when (-soever), whether (or), to whom, (who-)so(-ever). See 3361.
Pronounce: eh-an'
Origin: from 1487 and 302
aperchomai (Greek #565)
to go off (i.e. depart), aside (i.e. apart) or behind (i.e. follow), literally or figuratively
KJV usage: come, depart, go (aside, away, back, out, ... ways), pass away, be past.
Pronounce: ap-erkh'-om-ahee
Origin: from 575 and 2064