YOU SAID:

mondays are the worst except when it's off

INTO JAPANESE

毎週月曜日は、それがオフの場合を除いて最悪

BACK INTO ENGLISH

Every Monday is the worst except when it is off

INTO JAPANESE

毎週月曜日は、オフの場合を除いて最悪です

BACK INTO ENGLISH

Every Monday is the worst except for off

INTO JAPANESE

毎週月曜日はオフを除いて最悪です

BACK INTO ENGLISH

Every Monday is the worst except for off