I like swimming.
I had been learning swimming for some years when I was in elementary school.
My dream for the future has not been decided yet, so I will do my best to study for the time when my future dream is decided.
「I like swimming. When I was in elementary school, I learned to swim for several years. I haven't decided on my future dreams yet, so I'll do my best to study for when my future dreams are decided. 」