Abbott-Smith Manual Greek Lexicon
σύ (G5216)
2907 σύ , pron. of 2nd pers., thou, you , gen., σοῦ , dat., σοί , acc., σέ , pl., ὑμεῖς, -ῶν, -ῖν, -ᾶς (enclitic in oblique cases sing., except after prep. (BL, §48, 3), though πρὸς σέ occurs in Mt 25:39 ). Nom. for emphasis or contrast: Jo 1:30 , 42 4:10 5:33 , 39 , 44 , Ac 4:7 , Eph 5:32 ; so also perhaps σὺ εἶπας , Mt 26:64 , al. (M, Pr. , 86); before voc., Mt 2:6 , Lk 1:76 , Jo 17:5 , al.; sometimes without emphasis (M, Pr. , 85f.), as also in cl., but esp. as rendering of Heb. phrase, e.g. υἱός μου εἶ σύ ( בְּנִי־אַתָּה , Ps 2:7 ), Ac 13:33 . The gen. ( σοῦ, ὑμῶν ) is sometimes placed bef. the noun: Lk 7:48 , 12:30 , al.; so also the enclitic σοῦ , Mt 9:6 ; on τί ἐμοὶ κ. σοί , v.s. ἐγώ .
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain