A única alternativa errada quanto ao uso dos modal verbs é: * I can not answer these questions We should stay the night here I think I may go to the doctor today and try to get some antibiotics People must have manners in public! I would drink coffee if you bought me one
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A errada é People must have manners in public!
Quando a intenção é expressar algo que é ideal ou desejável, usa-se o modal should. Portanto, o correto seria people should have manners in public!