Obligación (must, have to), prohibición (mustn’t), no necesario (don’t have to) y consejo (should, ought to).
Formas
- must / should + infinitivo sin to, sin -s, sin do
- have to: she has to · Do you have to…? · had to (pasado) · will have to (futuro)
Significados
- mustn’t = prohibido
- don’t have to = no hace falta
- should / ought to = es buena idea
Errores frecuentes
- «must to», «should to» ✗ → must go, should go.
- Confundir mustn’t con don’t have to.
- «I musted» ✗ → I had to.