YOU SAID:

Gosh, oh gee, how happy I'd be, if I could only whistle

INTO JAPANESE

うわぁ、口happyだけしかできなかったら、なんて幸せだろう

BACK INTO ENGLISH

Wow, how happy would you be if you could only do happy mouth?

INTO JAPANESE

うわー、幸せな口しかできなかったら、どんなに幸せでしょうか？

BACK INTO ENGLISH

Wow, how happy would you be if you only had a happy mouth?

INTO JAPANESE

うわー、幸せな口しかなかったらどんなに幸せでしょうか？

BACK INTO ENGLISH

Wow, how happy would you be if you only had a happy mouth?