swim的过去式和过去分词怎么写?
swim的过去式是swam，过去分词为swum，意为游水;游泳;游泳(作为娱乐);游;游动。
例句They swam all afternoon.
他们游泳游了一下午。
He had not swum his best.
在游泳中他没有游出他的最高水平。
A shoal of fish swam past.
一群鱼游了过去。
We swam in the lake.
我们在湖里游泳。
His head swam and he swayed dizzily.
他感觉天旋地转，摇晃起来。
Jeff have you ever swum in a river or a lake?
杰夫你在江河或湖海中游过泳吗？
What\'s the maximum distance you\'ve swum?
你游得最远距离是多少？
And he has swum ever since.
从那时起，就一直从事游泳运动。