"和他的同学们说英语" 可以用英文表达为 "speak Engpsh with his classmates"。

这个表达方式的来源是英语中的动词 "speak" 和介词 "with"。"Speak" 是一个常见的动词，表示 "说，讲" 的意思。"With" 是一个介词，表示与某人或某事物有关系或在一起的意思。

下面是一些例句：

I speak Engpsh with my friends. (我和我的朋友用英语交流。)
He speaks French with his coworkers. (他和同事用法语交流。)
She speaks Spanish with her classmates. (她和同学用西班牙语交流。)

注意，如果你想表达的是和某人谈话，而不是和多个人交流，你可以使用 "speak to" 的结构。例如：

I speak to my mom in Engpsh. (我用英语和妈妈谈话。)
He speaks to his boss in French. (他用法语和老板谈话。)
She speaks to her teacher in Spanish. (她用西班牙语和老师谈话。)