we have forgotten
Hemos olvidado que tienes amigos de esa ciudad.
We've forgotten that you have friends from that city.
Está lloviendo y nos hemos olvidado de cerrar las ventanas.
It's raining, and we've forgotten to close the windows.
Oye, Edith, nos hemos olvidado de visitar la Biblioteca Nacional.
Hey Edith, we forgot to visit the National Library.
— Locuras de verano (1955)
We've forgotten something.
I think we've forgotten something.