G1620–ἐκτίθημι–ektithēmi

At length he was cast out, but Pharaoh's daughter adopted him, and brought him up as her own son.

ἐκτεθέντος ektethentos “When was being exposed”

Peter, however, explained the whole matter to them from the beginning.

ἐξετίθετο exetitheto “he was explaining [it]”

He began to speak boldly in the synagogue, and Priscilla and Aquila, after hearing him, took him home and explained God's way to him more accurately.

ἐξέθεντο exethento “they expounded”

So they arranged a day with him and came to him in considerable numbers at the house of the friends who were entertaining him. And then, with solemn earnestness, he explained to them the subject of the Kingdom of God, endeavouring from morning till eve

ἐξετίθετο exetitheto “he was expounding”