εις preposition
eis  ice: to or into (indicating the point reached or entered), of place, time, or (figuratively) purpose (result, etc.); also in adverbial phrases
νησον noun - accusative singular feminine
nesos  nay'-sos: an island -- island, isle.
δε conjunction
de  deh: but, and, etc. -- also, and, but, moreover, now (often unexpressed in English).
τινα indefinite pronoun - accusative singular feminine
tis  tis:  some or any person or object
δει verb - present impersonal active indicative - third person singular
dei  die: also deon deh-on'; neuter active participle of the same; both used impersonally; it is (was, etc.) necessary (as binding) -- behoved, be meet, must (needs), (be) need(-ful), ought, should.
ημας personal pronoun - first person accusative plural
hemas  hay-mas': us -- our, us, we.
εκπεσειν verb - second aorist active middle or passive deponent
ekpipto  ek-pip'-to: to drop away; specially, be driven out of one's course; figuratively, to lose, become inefficient -- be cast, fail, fall (away, off), take none effect.