σύ

σύ, gen. σέο, σεῦ, σεῖο, σέθεν, dat. σοί, τοί, τεΐν, acc. σέ: thou, thee. Most of the oblique forms are either enclitic or accented; σεῖο and σοί are never enclitic, τοί is always enclitic; in connection with αὐτός all forms retain their accent. The pron. is frequently strengthened by γέ or πέρ.