This document discusses the functions of words in context by explaining sentence structure and the four main functions that words can take on: nominal, adjectival, adverbial, and verbal. It provides examples of how the same word, such as "outside" or "fish", can take on different functions depending on the context and role in the sentence. The key functions are defined as nominal (noun-like roles as subjects or objects), adjectival (modifying nouns), adverbial (modifying verbs, adjectives or other adverbs), and verbal (relating to actions, moods or states). Understanding a word's function in context is important for comprehending the overall meaning of a sentence.