Learn what "i'm gonna find out who did this" means, when people say it, and how to use it naturally in English.

It means the speaker intends to discover the person responsible, often with anger or suspicion.
From The Perfect Husband, Episode 24
He is saying he plans to uncover who is responsible.
Use it when you are investigating a problem or threatening to expose someone. It can sound intense or threatening depending on tone.
Scenes unlock real expressions as you watch
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