at weekends; on weekends;at the weekend;;; on the weekend; ; on Saturnday and Sunday; 我们在周末聊了这些话题. And so it went for the weekend. ; on the weekend(s),at the weekend(s),over the weekend(s),during the weekend(s) on Sunday,比较通常的讲法 还有如果指明是哪个周日,如本周日,this Sunday,上周日,last Sunday,直接用,前面不用介词