Sentence examples for is this theory from inspiring English sources

-How is this theory proved?

But is this theory true?

After all, it is this theory that underlies the British Film Institute's retrospectives.

For instance, there is this theory that the cinema of tomorrow will only be in 3D.

But is this theory applicable to the President of the United States?

"There is this theory the universe is energy, that things work creatively when the right energies meet".

Was this theory sound?

Why is this act theory superior to an object theory?

Nor is this abstract theory.

Nor is this just theory.

This is the theory.