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Discover LudwigSuggestions(5)
"I don't know" is correct and usable in written English.
You can use this phrase when you are unsure of the answer to a question or unsure of a situation. For example: Q: What time does the store close? A: I don't know.
Exact(49)
"i dont know y ppl r gettin so bent outta shape about this".
"I dont know a single seller that would say, Dont throw any more buyers at me".
Aukerman: "I dont know.
"Now I dont know what to think.
I dont know when exactly it started.
"Oh, I dont know," she said.
Similar(8)
I do know that.
I do know Bliss.
That I do know.
I did know.
I wish I did know.
More suggestions(1)
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com