были сомнения

there were doubts

→ быть
phrase Uncommon #25,039
there were doubts Can also mean “had doubts” when the person with doubts is clear from context.
RU: У него были сомнения насчёт этого решения.
EN: He had doubts about this decision.

У меня с самого начала были сомнения.

I had doubts from the very beginning.