The boy is on the school football team 为什么on the team前要加is?

The boy is on the school football team 为什么on the team前要加is? The boy is on the school football team,为什么用介词on? the boy is the c______ of our school football team I play football on the school team Alan is()()()the school football team. He is on the school football team.（改为同义句） He ____ _____ ____ 是on football team还是on the football team He is also a basketball player on the school team. Mike is on the school football team.怎样翻译成汉语.句中的 on 能不能用 in t The football team-----trained on the playgroud on school team还是 on the school team Jim likes to play football and was on the school team.为什么用on