Car bomb in outdoor market kills 18 people, wounds 35

The video concludes with a brief message of encouragement, wishing the viewers good luck.

What does the phrase 'good luck' imply in a supportive context?

In what situations might someone say 'good luck' to another person?

How can the expression 'good luck' affect someone's confidence?

Can you think of a time when you wished someone 'good luck'? What was the context?

What are some alternative phrases to 'good luck' that convey similar sentiments?