Questions & Answers about oneureun himi eobsseupnida.
는 marks 오늘 as the topic: as for today / today, ...
So 오늘은 힘이 없습니다 has the feeling of:
- As for today, I have no energy
- Today, I’m out of energy
Using 는 can also create a slight contrast, even if it is subtle:
- Today I don’t have energy
(maybe on other days I do)
Without 는, 오늘 힘이 없습니다 is possible in casual spoken Korean, but 오늘은 sounds more natural and complete in careful speech.
In 힘이 없습니다, 힘 is the thing that does not exist / is absent, so Korean uses the subject marker 이/가, not the object marker 을/를.
The pattern is:
- Noun + 이/가 있다 = there is / have
- Noun + 이/가 없다 = there is not / do not have
So:
- 힘이 있다 = to have strength/energy
- 힘이 없다 = to have no strength/energy
Even though English says I don’t have energy, Korean often expresses this more like energy does not exist.