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Discover LudwigSuggestions(5)
The sentence fragment "has been frequent" is correct and usable in written English.
It is used to describe an action that has taken place repeatedly over a period of time in the past. For example, "Recent visits to the museum have been frequent since its reopening."
Exact(26)
But with limited resources and a poor record of protecting civilians, criticism of Monusco has been frequent and vicious.
Unrest has been frequent since the Kyrgyz police killed four people last spring in a particularly violent protest.
"Racism towards GRT (Gypsy, Roma, Traveller) people during my time in the police has been frequent, offensive and unchallenged.
Not so the coal industry, whose use of the term "clean coal" in the decades since has been frequent, enthusiastic, and too often free of caveats.
Since the takeover by Tribune, turnover has been frequent in The Times's top positions, in the newsroom and on the business side.
But there has been frequent interference by local military commanders, and in Zabul even the provincial governor tried to appoint the delegates himself, forcing United Nations and Afghan officials to cancel the election in the provincial capital.
Similar(31)
The headquarters has been frequented by American intelligence teams in recent months.
He has been frequenting the late sessions for several years and often stays until closing.
An ex-RAF man, Mr Spencer has been frequenting Spillers, he says, since 1971.
Since the restaurant was founded in 1942, it has been frequented by film stars - as the wall-photos prove.
Asymmetric shocks have been frequent.
More suggestions(18)
has been commonplace
has been consecutive
has been persistent
has been constant
has been widespread
has been numerous
has been regular
has been routine
has been repetitive
has been frequency
has been regularly
has been prevalent
has been recurrent
has been rife
has been asked
has been repeated
has been customary
has been pronounced
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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