97(3) A pronoun agrees with its antecedent in gender and number.
Examples (audio):
(a) βλέπω τὸν μαθητὴν καὶ διδάσκω αὐτόν, I see the disciple and teach him.
(b) μένω ἐν τῷ οἴκῳ καὶ γινώσκω αὐτόν, I remain in the house and know it.
(c) ἡ ἐκκλησία διδάσκει ἐμέ, καὶ ἐγὼ διδάσκω αὐτήν, the Church teaches me and I teach it.
(d) βλέπω τοὺς μαθητὰς καὶ διδάσκω αὐτούς, I see the disciples and teach them.
(e) βλέπω τὰ τέκνα καὶ διδάσκω αὐτά, I see the children and teach them.