Collaborative Listening and Speaking: Adapting Language Choices (Register), Part 3

The video tutorial explains the use of the prefix 'un' to indicate negation. It provides examples such as 'unopen', 'unhappy', and 'unlocked', demonstrating how the prefix changes the meaning of words to their opposites.

What is the meaning of 'unhappy' and how is it formed?

Explain the term 'unlocked' and its usage in a sentence.