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

It means the speaker is about to state something forcefully and remove any doubt.
From Lost And Found, Episode 8
Someone is challenging another person's authority and preparing to state their own position clearly.
Use this when you want to sound forceful before making a serious point. It is common in arguments, but it can sound blunt or hostile.
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