YOU SAID:

people party when they're sad because that's all they know how to do

INTO JAPANESE

人は悲しいときにパーティーをする、それしか方法を知らないから

BACK INTO ENGLISH

People party when they're sad 'cause that's the only way

INTO JAPANESE

人は悲しいときにパーティーをする、それが唯一の方法だから

BACK INTO ENGLISH

People party when they're sad 'cause that's the only way