Learn what "i'm not sure" means, when people say it, and how to use it naturally in English.

This means the speaker is uncertain about the person being discussed.
From Tied By Fate, Episode 27
The speaker is unsure who someone could be referring to.
Use this when you are guessing or honestly unsure who someone means. It can sound hesitant or defensive depending on tone.
Scenes unlock real expressions as you watch
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