About Tom Sawyer

Tom Sawyer is a very curious and adventurous boy, who is lazy most of the time and tries to get by with as little work as possible. When he is actually doing work though, like memorizing Robin Hood, his internal motivations are that he enjoys it and that it entertains him. An external motivation is that he has a friend, Joe Harper, to memorize it with him so they can recite the lines together and pretend they are in the book. He would rather do this than memorize bible verses.
When Tom is whitewashing the fence with Ben Rogers watching and taunting him, Tom decides to act as if his job is really fun. His external motivation was that he could get Ben Rogers, and many others, to whitewash for him, and trade treasures for it, by pretending it was an art. His internal motivation was that he wanted to get off work and into the shade while everyone would do his work for him.
When he won the Dorian bible by trading tickets for some treasures he had accumulated the day before Sunday school it probably wasn't for the actual bible, but for the attention from his peers, teachers, and most of all, from the visiting judge. Also, internally he would know he was clever and feel good about himself.
When Tom and Huckleberry Finn went to the graveyard with the superstition that they could get their warts to go away, Tom's external motivation was his warts. His internal motivation was to make Huckleberry Finn like him better and think Tom was cool by showing him that he was not scared of going to the graveyard with the dead cat in the middle of the night.
When Tom Sawyer decides to escape his village and run away to become a pirate, his external motivation was Becky and how she had treated him, first giving back the brass ball he had tried to give to her, then being mean to him and making him feel bad. His internal motivation was that he wanted to make everyone feel sorry for him and regret everything they ever did to hurt him.