YOU SAID:

i am the best at partying

INTO JAPANESE

私はパーティーが一番です

BACK INTO ENGLISH

I have the best party

INTO JAPANESE

最高のパーティーがあります

BACK INTO ENGLISH

Have the best party

INTO JAPANESE

最高のパーティーを

BACK INTO ENGLISH

Have a great party

INTO JAPANESE

素晴らしいパーティーを

BACK INTO ENGLISH

Have a great party