G1620–ἐκτίθημι–ektithēmi

and he having been exposed, the daughter of Pharaoh took him up, and did rear him to herself for a son;

ἐκτεθέντος ektethentos “When was being exposed”

And Peter having begun, did expound to them in order saying,

ἐξετίθετο exetitheto “he was explaining [it]”

this one also began to speak boldly in the synagogue, and Aquilas and Priscilla having heard of him, took him to `them', and did more exactly expound to him the way of God,

ἐξέθεντο exethento “they expounded”

and having appointed him a day, they came, more of them unto him, to the lodging, to whom he was expounding, testifying fully the reign of God, persuading them also of the things concerning Jesus, both from the law of Moses, and the prophets, from morning till evening,

ἐξετίθετο exetitheto “he was expounding”