关于第一次看海的英文短句有以下几种表达：
1. It's the first time I see the ocean by my own.
2. It's the first time I saw the sea.
3. I saw the sea for the first time.
4. It was the first time that I saw the sea.
5. It is the first time that I have seen the sea.
建议根据具体的语境选择合适的表达方式，例如在正式场合可以使用"It is the first time that I have seen the sea"，在较为随意的场合则可以用"I saw the sea for the first time"。
