ei (Greek #1487)
if, whether, that, etc.
KJV usage: forasmuch as, if, that, (al-)though, whether. Often used in connection or composition with other particles, especially as in 1489, 1490, 1499, 1508, 1509, 1512, 1513, 1536, 1537. See also 1437.
Pronounce: i
Origin: a primary particle of conditionality
exesti (Greek #1832)
so also ἐξόν (ex-on') neuter present participle of the same (with or without some form of 1510 expressed); impersonally, it is right (through the figurative idea of being out in public)
KJV usage: be lawful, let, X may(-est).
Pronounce: ex'-es-tee
Origin: third person singular present indicative of a compound of 1537 and 1510