Lindsay, the English adventurer, introduces three useful phrases for shopping in English, especially during Black Friday. The phrases include 'Can I try it on?' for trying clothes, 'Do you have my size?' for checking availability, and 'What's your return policy?' for understanding return options. These phrases help non-native speakers navigate shopping experiences in the US.

What does the phrase 'Can I try it on?' mean?

What is the context in which these phrases are useful?