He usually go shopping with my mother at weekends
问题描述：
He usually go shopping with my mother at weekends
答
He usually goes shopping with my mother on weekends.
go 要改成goes，因为主语是he 第三人称单数做主语谓语动词要用第三人称单数形式。
在周末用 on weekends不用at weekends。
答
应该是：He usually goes shopping with my mother at weekends.
usually 是频率副词.he 是第三人称,所以动词用goes