YOU SAID:
I’m so happy! I’m skiing!
INTO JAPANESE
私はとても幸せだ!私はスキーです!
BACK INTO ENGLISH
I am very happy! I am skiing!
INTO JAPANESE
私はとても幸せです!私はスキーをしています!
BACK INTO ENGLISH
I am very happy! I am skiing!
That didn't even make that much sense in English.