I could play football very well when I was younger.为什么不用when

I could play football very well when I was younger.为什么不用when I could play football very well when l was younger改成用he作主语. I could play football very well when l was younger.的意思 He could play football very well when he was younger he不是用we When I Was Younger 歌词 When I was five years old, I could play the piano well.的同义句 是I play football very well还是I play football is very well?为什么 when i was a boy,i could swim very much when i was younger i was interested in music.要was还是is,为什么 同义句转换：He could play the piano very well when he was only fiv I _______ football when I was young. I was able to play football when i was five years old改为同一句