Learn what "i can't believe" means, when people say it, and how to use it naturally in English.

This expresses shock and disbelief at a horrifying realization.
From Mysterious Murderer, Episode 44
The speaker reacts in shock after realizing they have been living with the person responsible for a terrible crime.
Use this in dramatic storytelling or when reacting to something shocking. It is not a general everyday phrase and sounds highly emotional.
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