求助英语达人这几句话有错吗1.I went to the training course the very next d

求助英语达人这几句话有错吗
1.I went to the training course the very next day
2.Learning to swim was no easy job for me
3.The coach showed me many times,but every time l tried l swallowed water instead of fresh air.
4.l didn't give up ,keeping trying until suddenly l found l could
这几句话都是我严格按照一本书上拷贝下来的,因为觉得有些奇怪所以来此请教各位语法和句式上是否有错,几句话的意思我都能理解所以请不要只给个解释,最好能有例句参考