Optional workbook for Language Arts for Grade 4 Readers . Consumable. Two-color workbook with exercises covering short and long vowels, hard and soft c and g ; r , s , and h blends; vowel- r combinations; silent letters; suffixes, syllables, vowel pairs, digraphs, diphthongs; plurals, possessives, contractions; prefixe Sonlight resource: https://www.sonlight.com/products/phonics-level-d