on sundays是一种时间的标志词，一般是用一般将来时态或一般现在时态。
on：prep. (覆盖、附着)在…上(意指接触物体表面或构成物体表面的一部分); 由…支撑着; 在(运输工具)上。
sundays：n. 星期日; 星期天; 每逢星期日出版的报纸; 星期日报。
扩展资料
She always went to chapel on Sundays.
她总是在星期天去教堂做礼拜。
Were mostly out on Sundays.
我们星期天一般不在家。
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。
The Council had brought proceedings to stop the store from trading on Sundays.
该委员会已经提起诉讼，禁止这家商店在周日营业。
He refuses to compete on Sundays because of his religious beliefs.
出于宗教信仰，他拒绝在礼拜天进行比赛。
