Learn useful ways to say "you could not" in English with drama examples and natural alternatives.

This means the speaker is saying the other person is not at fault because they had no way to know the truth.
From The Phoenix Conspiracy, Episode 8
Someone reassures another person that they could not have known Thomas was deceiving them.
Use this to calm someone down or remove blame in a conflict. It sounds natural in serious conversation and reassuring, not casual slang.
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