This document discusses different types of morphemes and how they are classified. It defines potentially free morphemes as those that can stand alone but do not necessarily, and bound morphemes as those that must be attached to another morpheme and cannot stand alone. It distinguishes between inflectional and derivational morphemes. Inflectional morphemes change grammatical features like number or tense without changing the word class, while derivational morphemes create new lexemes and can change the word class. It provides examples of inflectional and derivational affixes in English and discusses their properties.