主语部分如果带有with,即使后面有另一个人,也是为单数.所以,要填写goes.例如：
Mary and her mother often go shopping on weekends.
Mary with her mother often goes shopping on weekends.
类似的句子还有：
Mary,as well as her classmates,often goes shopping in the nearby shops.
是状语!中国人把它分得很细,有叫做伴随状语的.但是,无论是什么状语,只要记住英语的这种特殊用法,动词一定要单数就够了.当然,除非你将来当老师,就要搞明白这到底是什么状语.