This PowerPoint uses a Tree Map (Thinking Maps model) to teach students about prepositional phrases.
Separate PowerPoints are available to show students step-by-step instructions of how to build sentences.
Check out the free downloads: Teaching Nouns with a Tree Map,
Teaching Verbs with a Tree Map, Teaching Adjectives with a Circle Map, WWW1: Teaching and Practice: Subjects and Power Verbs, & WWW1: Assessing Subjects and Power Verbs. (WWW stands for Wonderful Words of the Week, my process of teaching students how to build sentences with common language.)