which were
Solo tenía que enterarme de cuáles eran.
I just had to find out what they were.
A diferencia de Chiang, yo tenía muy claro cuáles eran los problemas.
Unlike Chiang, I had a very clear idea of what the problems were.
No puedes entender cuáles eran mis sentimientos.
You can't understand what my feelings were.
— Rebeca (1940)
Tom le preguntó a Mary cuáles eran sus planes para el futuro.
Tom asked Mary what her plans were for the future.
Desde el principio le dejé claro cuáles eran mis sentimientos hacia él.
From the beginning, I made it clear to him what my feelings were towards him.