G1620–ἐκτίθημι–ektithēmi

When he was thrown out, Pharaoh's daughter took him up, and reared him as her own son.

ἐκτεθέντος ektethentos “When was being exposed”

But Peter began, and explained to them in order, saying,

ἐξετίθετο exetitheto “he was explaining [it]”

He began to speak boldly in the synagogue. But when Priscilla and Aquila heard him, they took him aside, and explained to him the way of God more accurately.

ἐξέθεντο exethento “they expounded”

When they had appointed him a day, many people came to him at his lodging. He explained to them, testifying about the Kingdom of God, and persuading them concerning Jesus, both from the law of Moses and from the prophets, from morning until evening.

ἐξετίθετο exetitheto “he was expounding”