This document provides a summary of Units 4-6 from the Traveller Pre-intermediate English textbook. It outlines the key grammar points, functions, and vocabulary covered in each unit. Unit 4 focuses on communication, technology, and money. Unit 5 discusses health, medical problems, and advice. Unit 6 is about enjoying free time, sports, and conditional sentences. The document provides explanations and examples of the target grammar, functions, and vocabulary for each unit.