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Discover LudwigSuggestions(5)
"may have formed" is correct and commonly used in written English.
It is used to express a possibility or uncertainty about something that could have happened in the past. Here is an example: "The rock formations in this area may have formed millions of years ago due to intense pressure and volcanic activity."
Exact(60)
Some of the moons may have formed along with their parent planets, and others may have formed elsewhere and been captured.
The moon may have formed after a colllision between a large meteor and Pluto.
Terraces that may have formed in this way are known around many reefs.
Over geological time, connecting channels may have formed and dissolved due to fluctuating water levels.
This geomorphological assemblage may have formed as recently as the last episode of high obliquity.
The layers of granite in migmatites, and perhaps larger granitic bodies, may have formed through anatexis.
By his second, they may have formed an opinion or two of their own.
Look for webbing that may have formed on infested packaging and foods.
Any remaining water on the surface may have formed saline brine pockets within the permafrost.
The cracks in the political landscape may have formed, but they have not opened into the chasms they are today.
Finally, sometimes the bad impression your colleagues may have formed has literally nothing to do with you.
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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