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Discover Ludwig"know for a fact" is a correct and widely used phrase in written English.
It is typically used to express certainty or strong belief about something. You can use it when you are confident in the truthfulness of a statement or when providing evidence to support your claims. Here is an example sentence: "I know for a fact that I turned off the stove before leaving the house because I distinctly remember doing so."
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I know for a fact it's not.
"We know for a fact it's not".
I know for a fact they didn't.
Do you know for a fact his girlfriend is dead?
Do you know for a fact his grandmother existed?
Do you know for a fact his girlfriend ever existed?
"But I know for a fact that some people didn't.
I know for a fact he respected me for it.
But I know for a fact that ballot was confusing".
"We know for a fact that we saved people's lives.
I know for a fact that Pirroni got his wish.
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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