YOU SAID:
The bored boarders boarded up the boarding house on the border
INTO JAPANESE
退屈した下宿人たちは国境の下宿に乗り込んだ
BACK INTO ENGLISH
The bored lodger boarded the boarderhouse
INTO JAPANESE
退屈した下宿人は下宿に乗り込んだ
BACK INTO ENGLISH
Bored lodger boarded the boarding house
INTO JAPANESE
退屈した下宿人が下宿に乗り込んだ
BACK INTO ENGLISH
Bored lodger boarded the boarding house
That didn't even make that much sense in English.