Phase 2 Letter Sounds Workbook - 12 PackLearn to read, write and spell at home or at school, all while having fun! Letter Sounds Workbook activities progress week by week around Phase 2 of the Letters & Sounds systematic phonics program. This workbook supports children as they begin to learn the 44 letter sounds of the English language. The Letter Sounds Workbook has been designed for 4+ year olds, and is the second of six workbooks that together form the Letters & Sounds Workbook program.