YOU SAID:

Your girlfriend was eating burgers next to my mom

INTO JAPANESE

あなたのガール フレンドは私のお母さんの隣にハンバーガーを食べていた

BACK INTO ENGLISH

Your girlfriend were eating burgers beside my mom

INTO JAPANESE

あなたのガール フレンドは私の母の横にハンバーガーを食べていた

BACK INTO ENGLISH

Your girlfriend were eating burgers beside my mother

INTO JAPANESE

あなたのガール フレンドは私の母の横にハンバーガーを食べていた

BACK INTO ENGLISH

Your girlfriend were eating burgers beside my mother