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The phrase "be gray" is correct and usable in written English.
It is a verb phrase that means to become or turn gray in color. It can be used in any sentence where you are describing something becoming gray in color. Example: As the storm clouds rolled in, the sky began to be gray and ominous.
Dictionary
be gray
adjective
Having a color somewhere between white and black, as the ash of an ember.
Exact(59)
It will be gray.
So one parent must be gray.
I may be gray, but I'm not tired".
"There may be gray areas in campaign finance," she said.
In theory, half of his foals will be gray.
By then, they will be gray beneath their snouts.
The exterior will be gray limestone imported from Macedonia.
But she said other areas could be gray, like an injury caused by a malfunctioning device.
Without carotenoids, flamingos would be gray (and deciduous trees would not erupt in autumnal glory).
It was not an Uromys rex, for those were known to be gray.
Similar(1)
I may be gray-haired, have creaky knees, and straddle two centuries, but I feel like I'm just getting started!
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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