How an unhappy little horse became happy. Spelling unpronounceable consonants at the root of a word

I repeat spelling patterns with my grandmother and mother! How can you help your elementary school student remember and learn to apply the rules for spelling unpronounceable consonants at the root of a word? A book that will help is... the workbook “How the Unhappy Little Horse Became Happy.” Third-grader Fedya has a wonderful last name - Zagvozdkin. After all, there is a nail hidden in it. One day, during a natural history lesson, Fedya accidentally came up with the Little Horse. Only the teacher got terribly angry and said that there was no such animal. And Fedin the Horse became very unhappy because of this. How can I fix everything and help him? Fedya decides to contact the Agency for Miraculous Transformations...