My little brother is young,and he knows a lot.哪里错了

My little brother is young,and he knows a lot.哪里错了 my little brother is young ,and he knows a lot.这句话哪错了? My brother is a s____fan.he knows a lot about football and b She is young but she knows a lot of.这句话哪里错了? Little Tom knows a lot of things t_____ he is very young. My brother studies in _ university and he knows a lot about young he is ,he knows a lot about the world Young man as he is,he knows a lot. ______ My younger brother is very younger,but he knows a lot He knows a lot who speaks little. Although/thangh he is young but he knows a lot这个病句怎么改? 求：Though he is young, he knows a lot.的倒装句（急!）