εἰ,
conjunctive particle, used in conditions and in indirect questions.
__I. Conditional, if;
__1. with indic, expressing a general assumption;
__(a) pres.: before indic, pres., Mat.11:14, Rom.8:25, al.; before imperat., Mrk.4:23 9:22, Jhn.15:18, 1Co.7:9, al.; before fut. indic., Luk.16:31, Rom.8:11, al.; before pf. or aor., with negation in apodosis, Mat.12:26, Rom.4:14, al.; similarly, before impf., Luk.17:6, Jhn.8:39; before quæst., Mat.6:23, Jhn.5:47 7:23 8:46, 1Pe.2:20;
__(b) fut.: Mat.26:33, 1Pe.2:20;
__(with) pf.: Jhn.11:12, Rom.6:5, al.;
__(d) aor.: Luk.16:11 19:8, Jhn.13:32, 18:23, Rev.20:15, al.
__2. Where the assumption is certain = ἐπεί: Mat.12:28, Jhn.7:4, Rom.5:17, al.
__3. Of an unfulfilled condition, with indic, impf., aor. or plpf., before ἄν, with imp. or aor. (see: ἄν, I, i).
__4. C. indic., after verbs denoting wonder, etc., sometimes, but not always, coupled with an element of doubt: Mrk.15:44, 1Jn.3:13, al.