Learn what "i wonder who that could be" means, when people say it, and how to use it naturally in English.

It means the speaker is trying to guess or identify a person they have noticed or heard about.
From I Think My Wife Wants To Kill Me, Episode 1
The speaker notices something and wonders who might be responsible for it.
Use this when you are curious or mildly puzzled about someone’s identity. It is common in everyday conversation.
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