在中午去上课可以用英语表达为 "go to class at noon" 或 "attend class at noon"。这些表达方式的来源是英语中用来表示时间的词语 "noon"，"go to" 和 "attend" 分别表示 "去" 和 "参加"。

一些英文例句及其中文翻译如下：

I have to go to class at noon today. (今天中午我必须去上课。)
She attends class at noon every Wednesday. (她每周三中午都上课。)
They are going to class at noon. (他们中午去上课。)
We will attend class at noon on Monday. (我们星期一中午会上课。)