我经常游泳在夏天可以用以下几种英语表达:I go swimming often in the summer.I frequently swim during the summer months.I enjoy swimming a lot during the summertime.During summer, I often go for a swim.I like to swim regularly in the summer season.以上是一些常用的表达,可以根据具体情境和个人喜好进行调整。