be obliged

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References in classic literature ?
Caderousse had become so gloomy that Andrea feared he should be obliged to notice the change.
The governor, of course, thought proper to threaten his prisoner that if he did not give up drawing such pictures he should be obliged to deprive him of all the means of amusing himself in that manner.
Yes, but after you had fired off your thirty thousand guns they would take the donjon; the donjon being taken, I should be obliged to let them hang you -- at which I should be most unhappy, certainly.