FROM STRONG’S GREEK DICTIONARY (1890)

Strong’s Greek Dictionary (1890) — public domain, printed whole.

eien εἰμί — i'-ane — optative (i.e. English subjunctive) present of 1510 (including the other person); might (could, would, or should) be:--mean, + perish, should be, was, were.

see GREEK for 1510