Sentence examples for this is theory from inspiring English sources

But this is theory and we also have experience, and recent history provides plenty of examples (and a dearth of counter examples) to the general principle that win or lose, as sure as winter follows fall, to care about politics is to experience continued frustration.

However, although this is theory true for the total amount of NO released by aortic endothelial cells exposed to a certain ACh concentration (an effect that was not actually observed in this study), this theory does not hold regarding sensitivity changes.

"This is my theory, which is my theory and which belongs to me.

This is not theory — this is practice".

"This is a theory," he emphasizes.

"This is a theory without a witness".

This is the theory I favour.

This is the theory, in any case.

This is, in theory, relatively simple.

At least, this is the theory.

This is, in theory, a weighty rule to prevent spying.