她经常读书用英语怎么说

"She reads books in English frequently" 可以说成 "她经常用英语读书"。
"She" 是主语，"reads" 是动词，"books" 是宾语，"in English" 是短语，表示她用英语读书。"frequently" 是副词，表示她经常这样做。
举例:
"She reads books in English every day." (她每天都用英语读书)
"She often reads books in English." (她经常用英语读书)
"She usually reads books in English." (她通常用英语读书)
这句话来自英语中常用的语法结构，即主语+动词+宾语+短语。