ellos servirán

will be useful, will do, will serve

→ servir
serv to be useful, to do + irán they will go / serve (future, 3rd-person plural)
verb · 3rd-person plural, future tense Rare #40,698
will be useful, will do In this form, it refers to more than one thing or person.
SP: Estas llaves te servirán.
EN: These keys will be useful to you.
will serve In this form, it refers to more than one person or thing.
SP: Ellos servirán en el ejército.
EN: They will serve in the army.
Conjugation of servir
Indicative future
SingularPlural
First serviré —
Second servirás —
Third servirá servirán
Subjunctive future
SingularPlural
First serviré —
Second servirás —
Third servirá servirán

Y nuestras cabezas desnudas les servirán de banquete.

And our bare heads will serve as their banquet.

Ambos son trabajadores, y lo servirán como corresponde.

They are both hard workers, and will serve you accordingly.

Éstos servirán también.

These will work too.

— ¡Adiós Lenin! (2003)

Estas eran mías, por ahora te servirán.

These were mine, they'll do for now.

— Señora venganza (2005)

No hagas más gestos porque esta vez no te servirán.

Don’t make any more gestures, because they won’t help you this time.

— Simón del desierto (1965)

De algo me servirán mis años mexicanos.

My years in Mexico will be useful to me in some way.

— Dolor y gloria (2019)