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

It is a soft lead-in for difficult news, used to prepare the listener for something serious.
From Sisters Have Crush On The Same Man, Episode 7
Someone is delivering bad news and admitting they do not know how to say it gently.
Use this before giving sad, serious, or awkward news. It sounds natural in careful speech, but the content that follows matters more than the phrase itself.
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