在办公室说英语可以用 "The teacher is speaking Engpsh in the office." 来表达。

这个句子的来源是英文的基本语法结构，其中 "the teacher" 是主语，"is speaking" 是谓语，"Engpsh" 是宾语，"in the office" 是状语。

一些其他例句和中文翻译如下：

The students are speaking French in the classroom. (学生们在教室里说法语。)
The teacher is teaching math in the classroom. (老师在教室里教数学。)
The students are learning Engpsh in the language lab. (学生们在语言实验室里学习英语。)
The teacher is grading papers in the office. (老师在办公室批改试卷。)