YOU SAID:

What's up, I've been so busy this weekend.

INTO JAPANESE

何が起こっているのか、私はこの週末とても忙しかった。

BACK INTO ENGLISH

I was very busy this weekend to see what was going on.

INTO JAPANESE

今週末は何が起こっているのか見るのにとても忙しかった。

BACK INTO ENGLISH

I was very busy seeing what was going on this weekend.

INTO JAPANESE

私は今週末に何が起こっているのかを見てとても忙しかった。

BACK INTO ENGLISH

I was very busy seeing what was going on this weekend.