What is the correct usage of phrase "you don't know what you don't know"? Can it be used in formal conversation/writing? I saw this sentence in the book 1Q84: It's not just you that don't know.

Understanding the Context

However, I am having trouble figuring out why (or whether) this is the correct way to write the sentence, as opposed to: ... "doesn't know" vs "don't know" [duplicate] - English Language & Usage ... Learn more about YouTube YouTube help videos Browse our video library for helpful tips, feature overviews, and step-by-step tutorials. YouTube Known Issues Get information on reported technical issues or scheduled maintenance.

Alice Rosenblum Leaks: What You Need To Know Now

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Complex: Drake DM Slide Reveal Gets Response From SSSniperWolf: 'Made Headlines for Leaving a Rapper on Read' Drake DM Slide Reveal Gets Response From SSSniperWolf: 'Made Headlines for Leaving a Rapper on Read' Want to start a career in data science? Learn how to become a data scientist in 5 simple steps. Know about salary, skills, qualifications, top courses, and more. Recently one of my friends told me that there is distinct difference between 'know of something' and 'know about something' expressions. 'know of' is used when you have personal experience with wha...

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Final Thoughts

"Know about" vs. "know of" - English Language & Usage Stack Exchange Examples: I know (about) this difficulty/problem. I know (about) Engineering. In the first sentence, it seems to me that "to know" expresses that the speaker experienced the problem/difficulty before while "to know about" only expresses that the speaker has heard or read about it.