如何使用 "swum" 造句

1. He should not have swum in the lake alone .
他本不应该独自一人在湖里游泳的。
2. They haven 't swum across the river yet .
他们没有游过河。
3. Have you ever swum in a river ?
你在小河里游过泳吗?
4. He had swum and boated with them .
他曾和他们一道游泳、划船。
5. However , someone has swum across the atlantic ocean , but it was assisted .
但是,的确有人横渡了大西洋,但他是在有帮助的情况下完成的。