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The phrase "is speculated to have been" is grammatically correct and usable in written English.
It can be used to signify that something is believed to have happened, although it is not certain. For example, "The cause of the fire is speculated to have been a short circuit in the wiring."
Exact(7)
La Venta Monument 1 is speculated to have been the portrait of La Venta's final ruler.
The meter is speculated to have been filled by players achieving the trophy and reaching the site.
He is speculated to have been tutored by Patriarch Photios I of Constantinople, but this is not supported by any source.
The nature of the accident is unknown, but it is speculated to have been a fall from his tightrope, explaining the end of his performances.
In one case the shooter's motive was speculated to be frustration and anger with his victims, in the other, the motive is speculated to have been anger about having someone who looked a certain way in his compound.
During the Oligocene, the climate of middle China is speculated to have been an arid/semiarid belt [ 59].
Similar(53)
The parasite was speculated to have been introduced with the Cane toad and to have spread widely in native Australian frogs [14], [36].
Red deer were brought into New Zealand from Europe around 1850, and PVNZ has been speculated to have been introduced from the old continent (8 ).
Based on the nucleotide sequence, the virus is speculated to have evolved and been maintained in an animal host.
Until now, no concrete role has been assigned to Tsl1 but it is speculated to have regulatory functions within the trehalose synthase complex [ 37].
The store was widely speculated to have been run by Apple, despite the company never confirming its involvement.
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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