Modal verbs can be combined with the passive voice in Spanish, the same way as in English, e.g "He should be put in prison" or "I had to be taken to hospital."
Learn how to use Spanish modal verbs with the passive
The modal verb is conjugated in the required tense and then followed by "ser" + past participle (agreeing with the subject).
For example:
Deber + passive
Ella debeser trasladada a otro hospital.She must be transferred to another hospital.
Este candidato deberíaser considerado para el nuevo puesto de director.This candidate should be considered for the new post of director.
Tener que + passive
Lidia tuvo queser atendida por el director del hotel.Lidia had to be taken care of by the hotel director.
Ellas han tenido queser acompañadas a casa porque era muy tarde.They had to be accompanied home because it was very late.
Querer + passive
La cantante no quisoser fotografiada por los periodistas después del concierto.The singer didn't want/refused to be photographed by the journalists after the concert.
El ganador no ha queridoser identificado en público.The winner didn't want to be identified publiclly.
Poder + passive
Las joyas perdidas no pudieronser localizadas.The lost jewels couldn't be found.
Los sacos de harina podránser distribuídos por las aldeas pobres.The sacks of flour can be distributed around the poor hamlets. [lit: will be able to be distributed]
Todos nuestros productos puedenser comprados en línea.All our products can be bought online.
Necesitar + passive
El producto necesitaser codificado.The product needs to be coded.
Las flores necesitaránser enviadas pronto.The flowers will need to be sent soon.
Remember:
Modal verb (conjugated) + ser + past participle (agreeing with subject)
Note that the passive voice is not as commonly used in Spanish as it is in English. Sometimes, to avoid the formal passive in Spanish, we find alternatives in the active voice or using the passive "se" construction.
For example for:
Las joyas perdidas no pudieron ser localizadas.
we could also say:
No se pudieron localizar las joyas. or Nadie pudo localizar las joyas.
without changing the original meaning of the sentence.
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Todos nuestros productos puedenser comprados en línea.All our products can be bought online.La cantante no quisoser fotografiada por los periodistas después del concierto.The singer didn't want/refused to be photographed by the journalists after the concert.Ella debeser trasladada a otro hospital.She must be transferred to another hospital.Este candidato deberíaser considerado para el nuevo puesto de director.This candidate should be considered for the new post of director.Lidia tuvo queser atendida por el director del hotel.Lidia had to be taken care of by the hotel director.Ellas han tenido queser acompañadas a casa porque era muy tarde.They had to be accompanied home because it was very late.El ganador no ha queridoser identificado en público.The winner didn't want to be identified publiclly.Las flores necesitaránser enviadas pronto.The flowers will need to be sent soon.Los sacos de harina podránser distribuídos por las aldeas pobres.The sacks of flour can be distributed around the poor hamlets. [lit: will be able to be distributed]Las joyas perdidas no pudieronser localizadas.The lost jewels couldn't be found.El producto necesitaser codificado.The product needs to be coded.