"经常教他英语" 是指 "teaching him Engpsh frequently" 或 "frequently teaching him Engpsh"。

这个短语的来源是英语中的动词 "teach" 和副词 "frequently" 的结合。"Teach" 指的是教授某种知识或技能的行为，而 "frequently" 指的是经常地、频繁地。

例句：

I frequently teach my son Engpsh after dinner. (我晚饭后经常教我儿子英语。)
She spends a lot of time teaching her daughter Engpsh every day. (她每天花很多时间教她女儿英语。)
He is dedicated to frequently teaching his students Engpsh. (他致力于经常教他的学生英语。)