请大家帮我把句子翻译成英文，急急急！！！！！！！！！！

1 Do exercise for half an hour before you jump into the water, or your leg will cramp.

2 Do not go swimming alone.

3 Do not swim in deep waters.

4 Do not swim for too long.

1. Warm up for half an hour before hitting the water (pool可以替代water如果指游泳池).
2. Do not swim alone.
3. Do not go to the deep-water area.
4. Do not stay too long in the water (pool).

1.The water for half an hour before the first movement, so that will not cramp legs.
2.Do not go swimming alone.
3.Not to go swimming in water too deep.
4.Do not swim in the water for too long.