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Discover Ludwig"Had used" is correct and usable in written English.
It is the past perfect form of the verb "use" and is used for referring to an action that was completed before another action in the past. For example, "John had used his car to drive to work every day before he bought a new one."
Exact(60)
Earlier racing had used carts.
What if the terrorists had used smallpox?
Mirveta had used her bare hands.
I had used a tape recorder throughout.
The protocol they had used was perfect.
We had used up all our time.
She had used it before, she said.
Previously the family had used $66.5 million.
The Jets had used all their timeouts.
Maybe Stephanie had used a different base.
He had used a wheelchair since then.
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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