εἰ

if, Mt. 4:3, 6; 12:7; Acts 27:39, freq.; since, Acts 4:9; whether, Mk. 9:23; Acts 17:11; that, in certain expressions, Acts 26:8, 23; Heb. 7:15; by a suppression of the apodosis of a sentence, εἰ serves to express a wish; O if! O that! Lk. 19:42; 22:42; also a strong negation, Mk. 8:12; Heb. 3:11; 4:3; εἰ καί, if even, though, although, Lk. 18:4; εἰ μή, unless, except, Mt. 11:27; also equivalent to ἀλλά, but, Mt. 12:4; Mk. 13:32; Lk. 4:26, 27; εἰ μήτι, unless perhaps, unless it be, Lk. 9:13; εἴ τις, εἴ τι, pr. if any one; whosoever, whatsoever, Mt. 18:28. The syntax of this particle must be learned from the grammars. As an interrogative particle, whether, Acts 17:11; in NT as a mere note of interrogation, Lk. 22:49