The word bastaban is the imperfect form of bastar in the third person plural.
See the full bastar conjugation

bastar

Ellos lo sabían todo y se bastaban a sí mismos.
They knew it all and were sufficient unto themselves.
Nuestros medios de defensa convencionales bastaban como medio disuasivo.
Our conventional means of defence were sufficient deterrence.
Ocho horas al día no le bastaban.
Eight hours a day wasn't enough for him.
Se consideró que estos indicios bastaban para justificar la apertura de un procedimiento.
This evidence was considered sufficient to justify the opening of a proceeding.
Por sí solas, esas tecnologías no bastaban para promover el desarrollo.
Information and communications technology alone was insufficient to promote development.
Los víveres disponibles no bastaban para el abastecimiento total de la población.
The available foodstuffs did not suffice to supply the entire populace.
Solo que los cinco sentidos no le bastaban, necesitaba más y más.
It's just that the five senses weren't enough for him, he wanted more.
Los progresos realizados por otros 7 países no bastaban para alcanzar el objetivo.
Another 7 were making progress, although insufficient to meet the target.
La OMC reconocía en su programa que las políticas comerciales por sí solas ya no bastaban.
WTO recognized in its agenda that trade policy itself was no longer sufficient.
Las inversiones y las actividades de asistencia técnica aisladas no bastaban para lograr una eliminación sostenible.
Stand-alone investment and technical assistance activities were not sufficient to achieve sustainable phase-out.
Sin embargo, esas proporciones no bastaban para cubrir los costos cada vez mayores de las operaciones sanitarias.
However, these shares fell short of increasing costs of health operations.
No bastaban los demás, también ella.
As if all the rest weren't enough, she had to say it too.
Me obligaba a hablar de temas tan personales que las palabras no bastaban.
You always force me to discuss things that are too personal to put into words.
El hambre y la miseria de su región de origen bastaban para impulsarles a emigrar.
The hunger and poverty of their places of origin were enough to drive them to emigrate.
La única dificultad planteada por este programa era que los recursos no bastaban para satisfacer la demanda.
The only difficulty faced under this programme was that resources were not sufficient to meet the demand.
En su opinión, los planes plurianuales por sí solos no bastaban para mejorar la situación financiera de la Organización.
In their view, multi-year plans alone were not sufficient to improve the financial situation of the Organization.
La Junta observó que las remesas de fondos de la UNMIK no bastaban para satisfacer las necesidades de la Misión.
The Board noted that remittances at UNMIK did not seem to match the actual needs of the Mission.
Pero esto hizo precisamente que las cosas alcanzasen un nivel en que los éxitos sintomáticos ya no bastaban.
But for this very reason the movement had arrived at a level where mere symptomatic successes were not enough.
Los expertos consideraron que los datos sobre corrientes y montos acumulados de IED por sí solos no bastaban para una adecuada formulación de políticas.
Experts felt that data on FDI flows and stocks alone are not sufficient for appropriate policy formulation.
Muchas mujeres y sus familias que antes se bastaban a sí mismas dependen ahora de la ayuda alimentaria y otros tipos de ayuda humanitaria.
Many formerly self-reliant women and their families are now dependent on food aid and other humanitarian assistance.
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