This document discusses asking for and giving opinions in both formal and informal situations. It provides examples of expressions that can be used to ask for another person's opinion, such as "What do you think of..." or "How do you feel about this decision?". Expressions for giving one's opinion formally include "I personally believe..." or "My own view of the matter is...". Informal ways to give an opinion include "I think I like it" or "In my opinion, I would rather...". The document notes that informal expressions are used between friends, while formal expressions are used in more professional settings like the office.