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? do,often,do,what,you,Sundays,on(?) What do they often do on Sundays.为什么这个句子的Sunday要加s?可有些句子没加s? What do you often 什么 on Sundays? what do you usually do on sundays用next sunday代替on sundays What do you do on Sundays?l often play( )football. What _ your cousin often _ (do) on Sundays? What( )she do on sundays?She often washes the clothes. They teach English college_______they do on Sundays.A.what B what do you（ ） do on sundays? What do you do on Sundays? what do you do on sundays?汉语