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Discover LudwigThe part of a sentence "this theory is" is a grammatically correct phrase and can be used in written English.
It is typically used to introduce or talk about a theory or concept, presenting it as a statement or fact. Example: This theory is based on the idea that human behavior is influenced by environmental factors.
Exact(59)
This theory is now discredited.
But this theory is a bit disputed.
This theory is good, but very difficult.
This theory is all wrong now.
This theory is about to be tested.
This theory is not supported by any reliable forensic evidence.
But at the very least this theory is inconsistently applied.
The evidence to support this theory is flimsy at best.
This theory is supported by a number of randomised experiments.
Too bad there's no proof this theory is right.
The advantage of this theory is its predictive capacity.
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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