This is the 166th most frequent Korean word.
시간이
"시간이" means "time is" or "time has" depending on context.
'시간이' acts as the subject of the sentence, indicating that time is the entity that passed.
시간이 빨리 지나갔어요.
Time passed quickly.
'시간이' is the subject here, emphasizing the lack of sufficient time as the reason.
시간이 부족해서 조금만 할 수 있어요.
I can only do a little because there is not enough time.
'시간이' highlights the presence of time in the future as the subject of the sentence.