one-off verb + (了) + duration + 了 (time since)
It has been … since …
After a one-off event (去世, 毕业, 买), a length of time + 了 says how long ago it happened: 他去世五年了 “he died five years ago”.
In stories
爷爷当了三十年警察，退休十年了。
爷爷已经去世五年了，我没法问他；
What does one-off verb + (了) + duration + 了 (time since) mean in Chinese?
It has been … since …. After a one-off event (去世, 毕业, 买), a length of time + 了 says how long ago it happened: 他去世五年了 “he died five years ago”.
How common is one-off verb + (了) + duration + 了 (time since)?
It comes up in 2 readings of the 392 stories and articles in our free Library.
Does it correct my mistakes?
No. It shows which patterns a text uses and what each one does; it doesn’t mark errors. Paste a sentence you wrote to see whether it uses the pattern you meant.
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Patterns found by our own parser; lines from our free Library.