同学你好，该知识点来自沪江网校《实用韩国语零基础至高级【随到随学班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好~
这里主语是my friend，这句话是可以的。
由as well as, with, along with, like, together with, rather than, except, but, including, accompanied by, plus, besides, in addition to, no less than 等引起的结构跟在主语后面，不能看作是并列主语，该主语不受这些词组引导的插入语的影响，主语如是单数，其谓语动词仍然用单数形式。例如：
The reading course book, plus its reference books, is helpful to college students.
教材加上参考书对大学学生是非常有益的。
The man together with his wife and children sits on the sofa watching TV.
那个人和他妻儿坐在沙发上看电视。

祝同学学习进步~