1过去式：swam
过去式题目：
1. He _swam_ (swim) back and forth five times up and down the swimming pool. 他在游泳池里游了5个来回。
2. And the water beetles always _swam_ (swim) behind him. 和水甲虫总是游在他后面。
3. He _swam_ (swim) quickly enough to pass the test. 他游得真够快，可以通过测试。
4. We _swam_ (swim) in river rapids, swung in hammocks and sucked in all the new experiences. 我们在激流中游泳，躺在吊床上休闲，消化所有的新体验。
5. He _swam_ (swim) with them, piggybacked them and attended them. 他带他们游泳，背他们，还要照料他们。
2过去分词：swum
过去分词题目：
1. Have you _swum_ (swim) in the Black Sea? 你们在黑海中游泳了吗？
2. I haven't _swum_ (swim) for almost two years. I think I need more practice. 我已经两年没游泳了，我想我要多练习。
3. It is the newest swimming style swum in competition, first _swum_ (swim) in 1933. 蝶泳出现于1933年，是竞技游泳的几种泳姿中最新的一种。
4. I have _swum_ (swim) every morning since 1980. 自从1980年，我就每天早上游泳。
5. Who else has _swum_ (swim) today? 还有谁今天去游泳了？
