I've seen phrases like 私は空 **を** 飛んでいますwhich mean "I'm flying in the sky" but
typically I see this represented as で like 私はプール **で** 泳いでいます meaning "I am
swimming in the pool".

I try googling it but I don't still don't understand. So It will be better if
you could provide some examples.
CC BY-SA 4.0
2021-05-30T22:19:26.847
86906
2021-05-31T01:08:16.523
44127
question
particles
when を means at