This document discusses the importance of explicitly teaching academic language across subjects. It identifies the three main components of academic language as vocabulary, grammatical structures, and functions. Vocabulary is categorized into three tiers - Tier I words are common everyday words, Tier II words are more advanced words used in different contexts, and Tier III words are specific to a content area. Effective strategies for teaching vocabulary include selecting words, recording definitions, learning meanings, and assessing understanding. Grammatical structures refer to parts of speech, sentences, punctuation, and other rules. Elements of grammar include form, meaning, and word order. The document emphasizes explicitly teaching these academic language components across different subjects.