我今天有點事不能來,可否改明天其他WEEKDAY?
Sorry that I am not able to come as I am busy today, shall we meet tomorrow or one of the weekdays?
在此, 我想談一談有關 weekdays (平日, 指星期一至五)這字. 你可說 one of the weekdays, 但不可說 one weekday (無 s).
因weekdays代表整個Monday to Friday而非其中一天, 所以一定有 s.