"Which class are you teaching in Engpsh?" 是一种询问使用英语上课的班级的句子。这句话的结构是疑问词+主语+动词+介词短语。其中的疑问词是 "which", 主语是 "you", 动词是 "are teaching", 介词短语是 "in Engpsh"。
例句：
"Which class are you teaching in Engpsh?"
"In which class are you teaching Engpsh?"
中文翻译：
"你在哪个班级上课用英语？"
"你在哪个班级教英语？"