How are you.
I wonder if there is any difference between 1 and 2?
1, when I grew up, I spent a lot of time playing baseball.
2, When I was growing up, I spent a lot of time playing baseball.
1 says you played AFTER you grew up
2 says you played WHILE you grew up
if you actually meant to say 1, i would rephrase it "After I grew up, i started playing a lot of basketball"