Simple past tense and past participle of conclude.
"I know you well enough," he concluded tersely.
The numerous concordats concluded towards the middle of the 19th century with several of the South American republics either have not come into force or have been denounced and replaced by a more or less pacific modus vivendi.
He concluded there was a major element he was missing.
Jack concluded that western Queensland might be a deep artesian basin.
A wild-eyed, crazed techno-optimist of the nineteenth century concluded that in fifty years there would be a telephone in every town in America.