
Lisa D. answered 07/10/19
Experienced Tutor for Latin, Liberal Arts, and Elementary Students
Lewis does imply the irony of that very fact in Prince Caspian, when the children return to Narnia and recall the skills they had during their reign that they did not retain upon returning to England. But the clearest answer to that probably comes at the end of The Voyage of the Dawn Treader, when the children learn that for them, the way to Aslan's country is through their own world, not through Narnia. They were sent to Narnia because they were needed there, but when they were no longer needed, they were sent home, and Aslan probably miraculously intervened to let them pick up their old lives with little trouble, and from what they learned and developed there, they retained only as much as would benefit their growth in holiness, not what would interfere with their normal lives.