YOU SAID:

jappy so-o-o happy when this happens to you

INTO JAPANESE

これはあなたに起こるとき嬉しそうとてもうれしい

BACK INTO ENGLISH

I am gladly happy when this happens to you

INTO JAPANESE

これがあなたに起こると私は嬉しく思います

BACK INTO ENGLISH

I am pleased that this will happen to you

INTO JAPANESE

私はこれがあなたに起こることを嬉しく思います

BACK INTO ENGLISH

I am pleased that this will happen to you