—PÉREZ GALDÓS.
(b) Tardar en may also be used to translate the expression before long.
They will be back before long.
No tardarán en volver.
(c) The adverbial phrases no longer, any longer are translated ya no.
I wonder why they are so long. I can't wait any longer.
¿Por qué tardarán tanto? Ya no puedo esperar más.
(d) The conjunctive phrase as long as is rendered mientras.
As long as it was raining we could not go out.
Mientras llovía no podíamos salir.