when will [he/she/it] return
Dime cuándo volverá Tom.
Tell me when Tom will be back.
Díganme cuándo volverá Tom.
Tell me when Tom will be back.
Decidme cuándo volverá Tom.
Tell me when Tom will be back.
Acaba de haber un apagón en toda la zona y no sabemos cuándo volverá la luz.
There has just been a power outage across the entire area and we don't know when the power will be restored.
Ask him when he'll be back.
I don't know when he'll return.
Dígame cuándo volverá Tom.
Tell me when Tom will be back.