couldn't, was unable to
아직 마님을 잊지 못했죠
You still haven't forgotten her, have you?
— 레베카 (1940)
그 아이는 어머니의 갑작스러운 죽음을 이해할 나이가 되지 못했죠.
The child was too young to understand their mother's sudden death.
— 스즈메의 문단속 (2022)