YOU SAID:
If your happy and you know it clap your hands
INTO JAPANESE
あなたの幸せとする手をたたくそれを知っている場合
BACK INTO ENGLISH
If you know it clap your hands to your happiness
INTO JAPANESE
自分の幸せに手をたたくことがわかっている場合
BACK INTO ENGLISH
If you know it clap your hands to your happiness
That didn't even make that much sense in English.