I was swimming
Je nageais souvent quand j'étais gamin.
I used to swim often when I was a kid.
Je nageais, et il est venu à ma rencontre dans un canoë.
I was swimming, and he came to meet me in a canoe.
— La Famille Tenenbaum (2001)
I was swimming in the river.
Je nageais plus vite quand j'étais jeune.
I used to swim faster when I was younger.