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Discover Ludwig"had been under" is grammatically correct and can be used in written English.
It is the past perfect tense of the verb "to be" and is used to indicate an action that was completed in the past before another past action. Example: John had been under a lot of stress before he finally decided to take a vacation.
Exact(58)
He had been under surveillance since then.
"The picture had been under my nose all my life.
Until then, he had been under house arrest.
Emwazi had been under surveillance for about five weeks.
The case had been under an order of silence.
The suspects had been under surveillance for some time.
The compound had been under the protection of Dutch peacekeepers.
Until Monday, the courtroom had been under tight security.
They said he had been under surveillance for months.
Similar(2)
At the time, many felt that these restaurants had been under-valued.
Therefore, it is possible that the frequency of T2D had been under-estimated.
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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