We do our homework everyday. I often read books . He often plays the piano on Staurdays. She sometimes goes to the park . I always go to visit my grandparents on Staurdays . 是要加s的,因为这个星期六不是单指一个星期六,星期六有无数多个,一定要加s。当要指一个星期六时,应该是The Staurday. 望采纳!!!
参考资料:自己写的。。。