Learn what "are you sure" means, when people say it, and how to use it naturally in English.

This is a check to confirm that there is only one copy of something.
From Faded Threads, Episode 38
Someone checks whether the item is truly the only copy.
Use this when verifying important documents, files, or objects. It sounds natural and polite enough for work or everyday conversation.
Scenes unlock real expressions as you watch
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