Deducir = decir lo seguro que estás: must (sí), might / may / could (quizás), can’t (no).
Presente
- must + infinitivo: She must be tired.
- might / may / could + infinitivo: It might rain.
- can’t + infinitivo: That can’t be true.
Pasado
- must have + participio: He must have left.
- might / may / could have + participio: They might have got lost.
- can’t / couldn’t have + participio: She can’t have known.
Errores frecuentes
- Deducción negativa con mustn’t ✗ → can’t.
- «must to be» ✗ → must be.
- «must of» ✗ → must have.
- «must has done» ✗ → must have done.
