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ellos alegrarán

will make (someone) happy, will cheer up

→ alegrar
alegr to make (someone) happy; to cheer (someone) up + arán 3rd-person plural future (indicative or subjunctive)
verb · third plural · future indicative Rare #41,273
will make (someone) happy, will cheer up Third-person plural (they/you all) future; often used with an indirect object pronoun (e.g., me, te, le, nos, les).
SP: La noticia les alegrarán el día.
EN: The news will make their day.
Conjugation of alegrar
Indicative future
SingularPlural
Third alegrará alegrarán
Subjunctive future
SingularPlural
Third alegrará alegrarán

Tus antiguos pacientes se alegrarán cuando se enteren.

Your former patients will be delighted when they find out.

— La piel que habito (2011)

Ellos se alegrarán mucho.

They will be very happy.

Se alegrarán mucho.

They will be very happy.

— El médico de Budapest (2020)

Algunas personas se alegrarán de que no esté.

Some people will be glad that I'm not there.

— Vivir (1952)

Las flores alegrarán la mesa.

The flowers will brighten up the table.