This is the 19585th most frequent Korean word.
어려웠다고
"It was difficult."
In this sentence, "어려웠다고" is used to indicate reported speech, referencing a past instance in which difficulty was acknowledged.
그 시험이 정말 어려웠다고 선생님이 말씀하셨어요.
The teacher mentioned that the exam was really difficult.
Here, "어려웠다고" references a past experience being challenging, with the context of someone else's reported speech.
어머니께서 그 경험이 참 어려웠다고 하셨습니다.
My mother said that the experience was truly challenging.
In this instance, "어려웠다고" conveys the students' reported opinion regarding the unexpected difficulty of the project.