关于except的用法-- ... but there are only five of his friends except his class teacher. 老师在吗？

Question

The monitor expects that besides students, their parents will also attend his
birthday party but there are only five of his friends except his class teacher.班长期盼
除了学生，他们的家长也能出席他的生日聚会，但是，除了老师只有 5 个朋友来
了。------既然except的“除了”是表示排除的意思，那老师究竟在不在生日聚会上呢？

Answer 1

老师在。 班长希望学生和家长都出席。 但是除了老师只有他的五个朋友出席。

Answer 2

except后所接的人是与前面不同的，排除在外的人！

Answer 3

用了except his teacher肯定teacher 是不在五个朋友之内,but there are only five of his friends的用法有点难明白.追问

谢谢回答。但是“用了except his teacher肯定teacher 是不在五个朋友之内”，那不就是besides 的用法了吗？--五个朋友外，还有老师在生日聚会上。那就应该用besides, 而不是用except了呀。