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Discover LudwigThe phrase "had multiplied" is grammatically correct and can be used in written English.
It is the past perfect tense of the verb "multiply" and is used to indicate an action that was completed before another past event. Example: By the time we arrived, the population of the town had multiplied, making it almost unrecognizable from when we last visited.
Exact(60)
In fact the obstructions had multiplied.
The cells, he said, had multiplied.
And they said that sponsor commitments had multiplied.
In earlier years, the poppy harvest had multiplied.
If the values had multiplied twentyfold, would they have complained?
The signs of depression, however, had multiplied over the last 15 months of her life.
The handful of hip little restaurants had multiplied to some 15 or 20.
Then Chris realized that they were small snakes and that his snake problem had multiplied.
By the middle of the afternoon, the number of people knocking on Schwartz's door had multiplied.
They had multiplied under Labour, and stood accused of marginalising the revered civil service.
The judicial investigations into his affairs had multiplied and the conflicts of interest were still unresolved.
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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