This report analyzes clauses in the book "Teach English" by Adrian. The objectives are to collect nouns, pronouns, adjectives, verbs and analyze clause types - independent, dependent, adjective, noun. The book contains 24 units to develop teaching skills. Each unit has activities for teachers to practice techniques. The report defines parts of speech and clause types, classifies examples from the book, then concludes that adverbial time clauses are complex but important for defining language details. Mongolian conveys time meanings more concisely than English despite similar grammar structures.