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The phrase "ran fast" is both correct and usable in written English.
You can use it any time you are expressing when one person or thing moves at an accelerated speed. For example: The rabbit ran fast and escaped the farmer's clutches.
Exact(43)
They ran fast".
If you ran fast you made it to Champs.
Well, he ran fast and he ran with grace.
She ran fast and well in winning for the first time in two years.
I ran fast, but just as fast as all four ahead of me.
I told her I ran fast, but for her the pace would be slow.
Similar(16)
Who ran faster?
I ran faster.
It runs fast.
Hot woks run fast.
And that clock runs fast.
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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