[tex] \Large{\boxed{\sf{Ellos \ \underline{\sf sabr\acute{a}n} \ la \ verdad.}}} [/tex]
[tex] \\ [/tex]
In the given sentence "Ellos (saber) la verdad", the subject "Ellos" indicates a third-person plural, so we need to choose the correct future tense form of the verb "saber".
[tex] \\ [/tex]
Conjugation of "SABER" (to know) in future tense:
[tex] \\ [/tex]
Yo sabré
Tú sabrás
Él/Ella/Usted sabrá
Nosotros/Nosotras sabremos
Vosotros/Vosotras sabréis
Ellos/Ellas/Ustedes sabrán
[tex] \\ \\ [/tex]
Therefore, the correct future tense form of the verb is "sabrán" .
[tex] \\ \\ [/tex]
The sentence becomes:
"Ellos sabrán la verdad."
This translates to: They will know the truth.