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Discover LudwigSuggestions(5)
"have a theory" is a correct and usable phrase in written English.
It means to possess a belief or explanation about something, based on observations or evidence. Examples: - "Scientists have a theory about how the universe was formed." - "Some economists have a theory that lowering taxes could stimulate economic growth." - "I have a theory that my coworker is stealing my lunch from the office fridge."
Exact(58)
I, too, have a theory.
I too have a theory about stuffing.
I tell him I have a theory.
"I have a theory", she says.
"I have a theory," he said.
"I don't have a theory.
He does have a theory about its origins, though.
Before he hung up, he added, "I have a theory".
I have a theory about why this is true.
But they also have a theory about fault.
Similar(1)
I have a theory about this.
More suggestions(18)
included a theory
supported a theory
identified a theory
established a theory
considered a theory
have a notion
involved a theory
received a theory
followed a theory
perceived a theory
described a theory
given a theory
presented a theory
encouraged a theory
advocated a theory
generated a theory
have a conjecture
have a reasoning
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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