For example, I have seen 元気じゃない and 元気がない, and now I'm wondering what is the
difference between the two?

ありがとうございます
CC BY-SA 4.0
2023-04-26T01:28:11.957
99448
2023-07-10T18:32:58.623
55638
question
grammar
Difference in がない vs じゃない in na adjectives
彼は元気じゃない -> He is not [a] 元気 (lively) [person].

彼は元気がない -> There is no 元気 (energy) in him. -> He is felling down.
CC BY-SA 4.0
2023-07-10T18:32:58.623
100246
2023-07-10T18:32:58.623
56959
99448
answer