Looking up...
他不久就会回来。
He will be back soon.
in a short time; soon
天气不久就会转暖。
The weather will warm up soon.
她不久前还在这里。
She was here not long ago.
Used to indicate a future event that will happen in a short period.
not long after; soon afterwards
他刚走不久。
He left not long ago.
Used to indicate a past event that happened a short time ago.
不久 can refer to both past ('not long ago') and future ('soon'). Context determines the exact meaning.
不久 typically appears at the beginning or middle of a sentence, often followed by a time-related verb or phrase.
Composed of 不 (not) + 久 (long time), originally meaning 'not for a long time'. The modern usage evolved to indicate brevity in time.
Used in both past and future contexts to indicate a short duration. Common in written Chinese and formal speech.