YOU SAID:

He had a hanger hung on his headphones

INTO JAPANESE

彼はヘッドフォンにハンガーを掛けていた

BACK INTO ENGLISH

he had hangers on his headphones

INTO JAPANESE

彼はヘッドフォンにハンガーをかけていた

BACK INTO ENGLISH

he put a hanger on his headphones

INTO JAPANESE

彼はヘッドフォンにハンガーをかけた

BACK INTO ENGLISH

he put a hanger on his headphones