The document provides examples of common greetings and expressions used in different situations. It introduces greetings like "Hello", "Good morning", "Good afternoon", and "Good evening" that can be used formally. More casual greetings like "Hi" are for informal contexts with friends. Expressions like "Goodbye", "Goodnight", and "See you" are for leaving or saying farewell. "Welcome" is used to greet someone arriving somewhere for the first time.