The document discusses English word and sentence structure. It defines morphology as the study of the internal structure of words and the rules by which words are formed. Morphemes are the minimal units of meaning, and can be divided into bound morphemes like prefixes and suffixes, and free morphemes which can stand alone. Words are formed from the combination of morphemes. There are different types of morphemes including root, stem, derivational and inflectional morphemes. Derivational morphemes change the part of speech of a word while inflectional morphemes indicate grammatical functions.