Gâteau et mauvaise coutume se doivent rompre=--A cake and a bad custom are fated to be broken.
Les herces doiventvenir apres, The harrowes must come after, Le chaclir oster l'ordure.
A later section of the same paper is headed: "Que les ecclesiastiques qui seront aupres de la Royne d'Angleterre doivent plustost estre Prestres seculiers que Religieux.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "doivent" in a variety of sentences. We hope that you will now be able to make sentences using this word.