Present progressive él/ella/usted conjugation of martillar.

martillar

El está martillando las paredes.
He's chopping away at the walls.
¿Quién está martillando a esta hora? ¡Llama al recepcionista y dile que no podemos dormir por el ruido!
Who's hammering at this late hour? Call the front desk clerk and tell him we can't sleep because of the noise!
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to season