The document discusses different types of phrases that can be used in sentences, including noun phrases, verb phrases, prepositional phrases, and adjective phrases. It provides examples of each type of phrase. The document also discusses idiomatic expressions, which are phrases or words that cannot be taken literally and instead have meanings beyond their basic dictionary definitions. Some common idiomatic expressions are explained, such as "above board", "at all costs", "birds of a feather", and "bundle of nerves".