What do they often do on Sundays?Sundays可以改成Sunday 吗?为什么?

What do they often do on Sundays?Sundays可以改成Sunday 吗?为什么?
What do they often do on Sundays?Sundays可以改成Sunday 吗?为什么?

What do they often do on Sundays?Sundays可以改成Sunday 吗?为什么?
可以.加s只是强调每个周日.

改不改一个意思。
比如说咱中文里： 你星期天都干什么的？ 和 你那些个星期天都干什么的？
一个意思嘛 。