He does, however, offer a theory about what might have happened.

He did not offer a theory to explain the time between attacks.

Asked why, people inside and outside the administration offered several theories.

No one could offer a theory to account for his disappearance.

He also offered a rather modest theory for why his store is so popular.

Players offer different theories why the Yankees began playing better.

The others took turns examining it and offered various theories as to the cause.

John Dewey offers a new theory of art and the aesthetic experience.

Administration officials have offered different theories about what may motivate the Soviet action.

I reserve the right to offer an alternative theory, though.