YOU SAID:

You must be fun at parties

INTO JAPANESE

あなたはパーティーで楽しいものでなければなりません

BACK INTO ENGLISH

You must be fun at the party

INTO JAPANESE

あなたはパーティーで楽しくなければなりません

BACK INTO ENGLISH

You must have fun at the party

INTO JAPANESE

あなたはパーティーで楽しい時間を過ごす必要があります

BACK INTO ENGLISH

You need to have a good time at the party

INTO JAPANESE

あなたはパーティーで楽しい時間を過ごす必要があります

BACK INTO ENGLISH

You need to have a good time at the party