[译] 老师将和学生们一起去参加那个聚会。
[误] The teacher, together with his students, are going to attend the party.

[正] The teacher, together with his students, is going to attend the party.
[注] 该句的主语是 the teacher, together with 引出的内容作状语，所以谓语动词的数应该与 the teacher 一致，用单数形式。