The best thing thato happened in to me this year iwas my vacation. It's my was the first time when I had ever seen athe sea. It was wonderful. I have swum a lot.swam a lot.
You can also say "happening" in place of "to happen".
You can say "a sea" but it is more common for us to say "the sea" and "the ocean". It would sound strange, for example, to say "I swam in an ocean this summer". Instead, you would say "I swam in the ocean" or "I swam in the Atlantic Ocean."
You can either say
"It was the first time I ever saw the sea"
or
"It is the first time I have ever seen the sea"
or
"It was the first time I had ever seen the sea"
...En savoir plus