The document provides an English grammar lesson on appositives. It defines appositives as nouns or pronouns that rename or stand for another noun or pronoun placed next to it. Examples of appositives include phrases like "the scoutmaster" and "Sparky, our first dog". Appositives are usually set off by commas and can be single words or phrases with modifiers. The lesson concludes with examples and practice identifying appositives in sentences.