ANSWER: The Greek has two verbs "to ask," one meaning to beg and the other to question. The latter is here used, and is thus translated in the American Revision, "In that day ye shall ask me no questions." In ver. 19 the disciples wished to question Jesus. He tells them that when the Comforter has come all will be clear; "the mysteries that now perplex you will then be illumined." "You will not need my personal instruction when you enjoy that of the Spirit." We are not forbidden to pray to the Lord Jesus as did dying Stephen.
— Steele's Answers pp. 176, 177.