YOU SAID:

Hello my luggage was left behind at the party

INTO JAPANESE

こんにちは私の荷物残されたパーティーで

BACK INTO ENGLISH

Hi my luggage was left at a party in

INTO JAPANESE

こんにちは私の荷物がパーティーで残っていた

BACK INTO ENGLISH

Hi my luggage was left at the party

INTO JAPANESE

こんにちは私の荷物がパーティーで残っていた

BACK INTO ENGLISH

Hi my luggage was left at the party