they forgot to; they forgot about
Nos enterraron pero se olvidaron de que somos semillas.
They buried us but forgot that we are seeds.
Cuando tenía ocho años, mi mamá y mi papá se olvidaron de mi cumpleaños.
When I was eight years old, my mom and dad forgot my birthday.
— Kajaki (2014)
They forgot to wake me up.
They forgot their umbrellas.