如题所述
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.
我星期天都会睡懒觉。
On Sundays, the family went three times to chapel.
每到星期天,这家人都会去做3次礼拜。