This document discusses the differences between formal and informal language styles. Informal styles tend to use contractions, personal pronouns, active voice, imprecise words, slang, Germanic words, shorter sentences and phrasal verbs. Formal styles prefer depersonalized language, passive voice, precise words, formal expressions, Romance words, longer sentences with linking words and single verbs. The styles are a continuum, and texts can combine both formal and informal features or fall anywhere along the scale between them.