"it's on sunday" means that something is scheduled or planned to happen on a specific sunday in the future, while "it's sunday today" means that today is currently sunday. Sep 1, 2024on last sunday和last sunday区别last sunday前是不加on的。由形容词last，next等指示代词修饰的名词词组用作时间状语时，前面的介词at, on, in一般省略。例如：i saw him in the street. On sunday 是特指一个星期天 英 [ɔn ˈsʌndi] 美 [ɑn ˈsʌndi] 例如:i will leave on sunday.
On sundays 是指一般的星期天 例如 i swim on sundays. I have a lie-in on sundays.
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