3-Part Letter Sound CardsMaster Letter Sound Knowledge with these self correcting Letter Sound 3 Part Cards. Students layout the letters digraphs and match them to an iconic picture that features the key sound. They use the control card (letter digraph and picture on one card) to check their own work. Use these to introduce the key sound for each letter digraph; with these, you can phonetically spell all words in English! These key sounds lay the foundation for understanding