YOU SAID:

there is a guy that smacked his own mustache off his face.

INTO JAPANESE

彼の顔に口ひげを叩か男があります。

BACK INTO ENGLISH

His face smacked a guy there.

INTO JAPANESE

彼の顔は、そこにいた男を叩か。

BACK INTO ENGLISH

His face smacked man was there.

INTO JAPANESE

彼の顔をひっぱたいた男がそこにいた。

BACK INTO ENGLISH

There was a man slapped his face.

INTO JAPANESE

男は、彼の顔を平手打ちがあった。

BACK INTO ENGLISH

He had his face slapped.

INTO JAPANESE

彼は彼の顔を平手打ちをしていた。

BACK INTO ENGLISH

He had slapped his face.

INTO JAPANESE

彼は彼の顔を平手打ちしました。

BACK INTO ENGLISH

He has his face slapped did.

INTO JAPANESE

彼は彼の顔を平手打ちしました。

BACK INTO ENGLISH

He has his face slapped did.