swim的过去式和过去分词形式是什么

　　Let's go for a quick swim in the pool.

　　咱们去游泳池游会儿泳吧。

　　She trained five times a week at her local swimming pool.

　　她每星期在当地的游泳池训练五次。

　　I think I'll go for a swim.

　　我想去游泳。