answer:I don’t know about a program but I have enjoyed diagramming sentences. I haven’t done it for many years. I do, however have a suggestion about erasers. I hove found that the white, soft erasers do a much bette job than the harder reddish ones. The white erasers clean pencil marks much better and don’t tear or scrape the paper. I have some old English books and my start diagramming since I find myself with much time on my hands.