This document discusses different approaches to analyzing grammar and sentence structure. It describes traditional grammar which used categories from Latin and Greek to label parts of speech in English. It also discusses descriptive approaches like structural analysis and immediate constituent analysis which observe how sentences are actually used without preconceived notions. Immediate constituent analysis diagrams show how words form phrases and sentences through labeled brackets. Analyzing sentences in other languages like Gaelic reveals how structure can differ from English. Understanding these approaches helps explain errors language learners may make based on differences in their native language.