Modal Verbs: poder, querer, dever

📌 Nota gramatical

The verb 'poder' is used to express permission, possibility, or ability. In the present indicative, its conjugation is irregular: eu posso, tu podes, ele/ela/você pode, nós podemos, vós podeis, eles/elas/vocês podem. It is always followed by a verb in the infinitive without any preposition.

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The verb 'querer' expresses desire, wants, or intentions. Its present indicative conjugation is highly irregular: eu quero, tu queres, ele/ela/você quer, nós queremos, vós quereis, eles/elas/vocês querem. Like 'poder', it is followed directly by an infinitive.

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The verb 'dever' expresses obligation, duty, or strong recommendation (equivalent to 'should' or 'must'). Unlike 'poder' and 'querer', 'dever' is a regular -er verb in the present tense: eu devo, tu deves, ele/ela/você deve, nós devemos, vós deveis, eles/elas/vocês devem.

📌 Nota gramatical

In European Portuguese, modal verbs (poder, querer, dever) are followed directly by the main verb in its dictionary form (infinitive). No prepositions like 'a' or 'de' are placed between the modal verb and the main infinitive verb.

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When a modal verb is used with an infinitive and an unstressed object pronoun (me, te, o, a, nos, lhes), European Portuguese allows the pronoun to attach to the modal verb (proclisis because of the modal trigger) or to the infinitive (dropping the 'r'). At A2, placing the pronoun before the modal verb is very common and standard.

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To express prohibition or that something is not allowed, use 'não' directly before the conjugated form of 'poder' followed by the infinitive. This translates to 'cannot', 'must not', or 'are not allowed to'.

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To make polite requests in daily situations (like in cafes, shops, or asking favors), Portuguese speakers frequently use the present tense of 'poder' or 'querer' in interrogative sentences. 'Poder' is often used for 'Could you...?' and 'Querer' for 'I would like...'

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It is crucial to distinguish the semantic nuance of modals. 'Dever' imposes a duty, rule, or strong recommendation ('must / should'), whereas 'poder' grants permission or states capability ('can / may').

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Besides obligation, 'dever' followed by an infinitive is frequently used to express likelihood or a logical guess about a present situation, equivalent to English 'must be' or 'probably'.

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To ask for permission to do something in a public space or informal setting, start a question with 'Posso' followed by an infinitive verb. This is standard etiquette when entering rooms, using items, or requesting actions.

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Modal verbs seamlessly combine with everyday routine vocabulary (e.g., pequeno-almoço, autocarro, casa de banho) to discuss daily plans, necessities, and obligations around the house or workplace.

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At level A2, mastering 'poder' (ability/permission), 'querer' (desire), and 'dever' (obligation/probability) allows you to navigate almost all daily social interactions, polite requests, and basic rules without complex structures.