Must – verbo auxiliar

Ahora, vamos a elaborar sobre el verbo modal: must (Nótese que, los verbos modales, jamás van seguidos por ‘to’ antes del infinitivo, a salvo de ought to, need to y dare to).

Su uso principales para expresar obligación

• Jeremy must be home by nine o’clock.
• Amy, you must not bully your sister.
• Please, you mustn’t tell my dad about this secret.
• You must not make false claims.

Se usa para deducir o expresarse en lo que creemos tiene certeza

• My workmate arrived late this morning. The boss must have been irritated.
• Our country, Finland, gets far too cold in winter. It must be hard during January.
• Our department has increased its productivity by 50%, therefore, it must be going well.
• You must be lying, am I right?
• He couldn’t have got here so fast, he must have been speeding.

Se utiliza para dar consejos, hacer sugerencias o recomendaciones

• Listen, you must talk to your friend, he’s upset.
• You must see outside the box.
• We must pay attention.
• If you guys want to get the position, you must work harder.
• You must come to my gym, it’s the best.

Diferencia entre ‘must’ y ‘have to’

• ‘Must’ puede ser sustituido por ‘have to’ con muy poca diferencia en su significado. ‘Have to’ es solo un poco más formal que ‘must’.