it was difficult
It was difficult to do.
It was difficult at first.
Нам было трудно решить, какой купить.
We had a hard time deciding which one to buy.
Ей было трудно скрыть от него правду.
It was difficult for her to hide the truth from him.
Убедить Тома было трудно.
It was difficult to convince Tom.
Было трудно сказать, находится ли Том у себя в комнате.
It was difficult to tell whether Tom was in his room.