ellos deben

they must

→ él
phrase Rare #35,628
they must Depending on context, this can also mean “they should.” With haber followed by a past participle, it can express a deduction, as in “they must have.”
SP: Ellos deben estudiar para el examen.
EN: They must study for the exam.

Ellos deben tener más cuidado.

They need to be more careful.

Ellos deben decidir el cómo acabar con él.

They must decide how to end it.

Ellos deben venir acá de inmediato.

They need to come here immediately.

Ellos deben odiarme realmente.

They must really hate me.

Ellos deben haber estado cansados.

They must have been tired.

Sabe que no puede confiar en el correo, o ellos deben haberse mudado.

She knows she can't trust the mail, or they must have moved away.

— Estación central (1998)

Ellos deben colaborar.

They must cooperate.

— M: El maldito (1931)

Ellos deben pensar que la victoria fue suya.

They must think that the victory was theirs.

Ellos deben decidir cómo acabar con él.

They must decide how to end it.

— El señor de los anillos: La comunidad del anillo (2001)