Learn what "i know because" means, when people say it, and how to use it naturally in English.

This means the speaker is claiming close personal experience and using it to justify their opinion.
From Duty Or Desire, Episode 44
Someone is defending their opinion by saying they have been present through everything.
Use this when you want to show you have first-hand knowledge in an argument. It can sound defensive or self-important if overused.
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