The document provides an overview of key elements of describing language, including:
1. Sentence constructions such as subject, verb, object, complement, and adverbials.
2. Parts of speech like nouns, verbs, adjectives, adverbs, determiners, prepositions, pronouns, and conjunctions.
3. Verb forms including tense, aspect, voice, and types.
It discusses the forms and uses of these various linguistic elements to describe language.