must
In Italian, 'deve' is used as a form of the verb 'dovere' which means 'to have to' or 'must'. It's used when indicating an obligation, necessity, or duty. The context and sentence structure determine its precise interpretation.
Mario has to go to school tomorrow
In this sentence, 'deve' is used to express obligation or necessity. It is the third person singular of the verb 'dovere', which means 'to have to' or 'must'. Hence, the sentence means that it is necessary for Mario to go to school the next day.
The dog must eat his food
In this sentence, 'deve' is used to indicate what the dog is required or expected to do. It is third person singular of the verb 'dovere', meaning 'to have to' or 'must'. The sentence is expressing that it is necessary for the dog to eat his food.
You must not speak loudly in libraries
Here, 'devi' is the second person singular form of 'dovere', used to express prohibition. Combined with 'non' before it, it forms the structure 'non devi' which is equivalent to 'must not'. The phrase implies that the rule or expectation is that one should not speak loudly in libraries.