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Discover LudwigThe phrase "should of" is not grammatically correct and should not be used in written English.
It is a common mistake for native speakers to say "should of" instead of the correct phrase "should have." Example: Incorrect: "I should of gone to the store earlier." Correct: "I should have gone to the store earlier."
Dictionary
should of
verb
Also a common misspelling.
Exact(56)
(They should, of course).
It should of been yesterday.
As well they should, of course.
Should of let him go to prison.
Damn if I should of rescued him!
This should of course have been 0.7% and 1%.
"We should of drowned 'em," one says.
It should, of course, have said regenerate.
"Hat" should, of course, be "What".
I should, of course, have known much better.
It should of course be called The Earthling.
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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