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Discover LudwigThe phrase "have not once" is grammatically correct and can be used in written English.
It can be used to express that something has never happened or been done even once. For example: "I have not once regretted my decision to move to a new city." This sentence means that the speaker has never regretted their decision, at any point in time. Another example could be: "He has not once thanked me for helping him." This sentence means that the person has never expressed gratitude to the speaker, despite multiple instances of helping.
Exact(29)
I have not once seen any genitalia".
"Then how come they have not once heard about this?
I have not once had to disperse anyone.
Yet for over half a century since the promulgation of Rule 41(b), we have not once done so.
In the many conversations I have had with the right, I have not once even inferred they might be racist.
It said: "We have not once in nearly 40 years of operation been charged with criminal wrongdoing.
Similar(31)
Since 1966 we haven't once advertised.
I haven't once considered reverting to wired headphones.
They haven't once looked at the hospital".
I've never been injured, never been hurt, and haven't once been sick.
I haven't once worn a T-shirt in the office since that evening, nor trainers.
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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