πλην adverb
plen  plane: moreover (besides), i.e. albeit, save that, rather, yet -- but (rather), except, nevertheless, notwithstanding, save, than.
ο relative pronoun - accusative singular neuter
hos  hos: the relatively (sometimes demonstrative) pronoun, who, which, what, that -- one, (an-, the) other, some, that, what, which, who(-m, -se), etc.
εχετε verb - present active indicative - second person
echo  ekh'-o:  (used in certain tenses only) a primary verb; to hold
κρατησατε verb - aorist active middle - second person
krateo  krat-eh'-o: to use strength, i.e. seize or retain -- hold (by, fast), keep, lay hand (hold) on, obtain, retain, take (by).
αχρις preposition
achri  akh'-ree: (through the idea of a terminus); (of time) until or (of place) up to -- as far as, for, in(-to), till, (even, un-)to, until, while.
ου relative pronoun - genitive singular masculine
hos  hos: the relatively (sometimes demonstrative) pronoun, who, which, what, that -- one, (an-, the) other, some, that, what, which, who(-m, -se), etc.
αν particle
an  an: denoting a supposition, wish, possibility or uncertainty
ηξω verb - aorist active subjunctive - first person singular
heko  hay'-ko: to arrive, i.e. be present -- come.