一个英语语法问题my brother and myself both like swimming.在这个句子中为什么要用

一个英语语法问题my brother and myself both like swimming.在这个句子中为什么要用 my mother and my father are both like bananas.对吗,这个句子中可以出现两个 i like swimming,diving,and riding my bike为什么用, My brother and I ( ) swimming. 这个题为什么用policeman,而不用polices. 题：Both my sister and my brother I like swimming中swimming为什么要用现在分词 Rose and Mary are both like swimming句子里的are要加吗 John and Joan both like singing very much 中为什么用both Both my brother and I like sciece b___ it's very intetesting My brother and I both like football .we usually ()after scho 用both,they ,swimming ,do,like(?) 联句 My brother and I are both of middle height.请问为什么不说 my brothe