so,my elder brother,worked very hard at his study,and,my younger sister,did连词成句
问题描述：
so,my elder brother,worked very hard at his study,and,my younger sister,did连词成句
答
My elder brother worked very hard at his study, and so did my younger sister.
要保持人称一致， 只有这样才是对的。
答
my elder brother worked very hard at his study，and so did my younger sister
或者 my younger sister worked very hard at his study，so did my elder brother.
答
my elder brotherworked very hard at his study,and so did my younger sister.