我经常去游泳用英语怎么说

可以说是 "I swim frequently" 或 "I go swimming frequently". "Swim" 是动词，意思是 "游泳"；"frequently" 是副词，意思是 "经常".

一些英文例句和中文翻译：

"I swim at the local pool every morning"：我每天早上在当地的游泳池游泳.
"Swimming is my favorite form of exercise"：游泳是我最喜欢的锻炼形式.
"I've been swimming regularly for the past year"：我已经有一年定期游泳了.

来源："swim" 和 "frequently" 都是英语词汇，是固有的语言资源。