是“at the weekends"还是“at weekends"?

是“at the weekends还是“at weekends? on weekends=at the weekends吗?或是on weekends=at the weekend还是on weekends=at weekends 是on the weekends还是at she weekends详细和为什么 在周末是at weekends or at the weekends at the weekends,at weekends哪个是对的?at the weekends,at weekends哪个是对的? 在周末他想去看电影用英语怎么说 (不是过去式)在周末是on weekends还是on the weekends还是at weekends 是spend the weekends 还是spend weekends急~! 英语中,是in weekends 还是in the weekends ,急! ①在周末该怎么说?是at weekends还是on weekends还是at the w①在周末该怎么说?是at weekends还是on weekends还是at the weekend还是on the weekend.怎么区分?②还有在工作日怎么说? 有on the weekends吗一般好像听过on weekends和on the weekend是________the weekends呢?at? 在周末英语怎么说是on weekends还是at weekends.在工作日是on weekdays吗? 到底是on weekends还是at weekends比如：It's quiet there_________weekends. on weekends、at the weekends、at weekends、on the weekends有什么区别 初中英语介词（ ）weekends 是in还是at（ ）the evening of August 8th 2008,是in 还是on还是at 英语中是in the morning on weekends 还是on the morning on the weekends? 是in the weekends还是on the weekends我不确定,但是要写作文.麻烦帮帮忙. 是in weekends 还是on weekends? at weekends和at the weekend 区别