le preguntaremos a

we'll ask

→ le
phrase Rare #40,872
we'll ask Used when saying that we will ask someone. “Le” refers to the person being asked, and “a” introduces that person, as in “a Tom” or “a su madre.”
SP: Le preguntaremos a la profesora mañana.
EN: We'll ask the teacher tomorrow.

Le preguntaremos a éI.

We'll ask him.

— El espejo (1975)

Le preguntaremos a Tom.

We'll ask Tom.

Mañana iremos y le preguntaremos a su madre.

We'll go tomorrow and ask his mother.

— Funny Games (1997)

Le preguntaremos a Alí a ver qué opina.

We’ll ask Ali to see what he thinks.

No se, le preguntaremos a Costa.

I don't know; we'll ask Costa.

— También la lluvia (2011)