In the last eight lessons of Essentials, students learn the remaining phonograms and spelling rules and apply these concepts, as well as those from previous Essentials lessons, to increasingly complex words. In addition, they learn advanced phonograms, new grammar concepts, new morphemes, and linguistic concepts that shape our spelling and pronunciation such as assimilation of sounds and "shades of sound" - the way sounds in a language can change shape in different sound contexts.  

New concepts introduced in Lessons 23-30 include:

• the last four of the 75 basic phonograms
• the last four of the 31 spelling rules
• how to add a suffix to any word
• grammar concepts including linking verbs, helping verbs, verb tense and aspect, sentence types, and compound and complex sentences
• dozens of new prefixes, suffixes, and roots found in words in the 23-30 spelling lists
• nine advanced phonograms taught to all levels, plus eighteen more introduced only in level C