There are many long sections in the book of John that are obviously Jesus preaching sermons. Imagine John sitting there taking notes to remember everything that Jesus talked about.
Jesus preaches about heaven, hell, salvation, atonement, his death, his future resurrection, and about everything else that his disciples would need to know. During these long sections you notice that it's not a dialogue; it's a monologue—Jesus is preaching. He's speaking with the authority given him, and his words are weighty.
When we make disciples we must preach to them at times. There are times for discussion, back and forth, and chit-chat—but there are other times for a good word preached.
Jesus allowed his disciples to ask questions
Jesus does not exclusively use preaching as his method of teaching, but he also allows question and answer time. He doesn't confine himself only to the 'Air War' strategy of preaching from a pulpit and retreating to his office. He follows up his sermons by allowing interaction.
This is a series of reflections on how Jesus made disciples, based on the book of John.