Learn what "why couldn't you" means, when people say it, and how to use it naturally in English.

It is a blaming question that means the speaker thinks the person should have done more to help or protect their sister.
From Destined To Be, Episode 4
Someone criticizes a family member for not taking proper care of a sister.
Use this in a family conflict when blaming someone for poor responsibility. It can sound accusatory and emotionally charged.
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