at weekends和on weekends的区别

at weekends和on weekends的区别 on weekends和at weekends有什么区别? 有on the weekends吗一般好像听过on weekends和on the weekend是________the weekends呢?at? on weekends=at the weekends吗?或是on weekends=at the weekend还是on weekends=at weekends at weekend,on weekend,at the weekend ,on the weekend,on the weekends,at weekend和on weekends区别?at weekend,on weekend,at the weekend ,on the weekend,on the weekends ,at the weekends,at weekends和on weekends的区别? on weekends、at the weekends、at weekends、on the weekends有什么区别 是on the weekends还是at she weekends详细和为什么 在周末的英语除了on the weekends 和at the weekends 以外还有什么表达方式 区别at the weekends,on the weekend,at weekends,on weekendsat the weekends,on the weekend,at weekends,on weekends都有些什么区别?各自的意思是什么? at the weekends跟on the weekends的区别 英语：at weekends为什么不用on weekends?详细! at weekends 和 on weekends 在意思和用法上有什么区别,并请翻译一下这两个词组 at weekend,on weekend,at the weekend ,on the weekend和on weekends的区别?尽量详细些... on the weekend ,on weekends at the weekend ,at weekends 分别表示某个固定的周末和一般性的每个周末.怎么理解这些 at weekends和at the weekend 区别 on weekends at weekends have a weekends的区别.有什么区别 their teacher sometimes does the housework at home on weekends改为一般疑问句和否定句 区别at the weekends,on the weekend,at weekends,on weekends 我要北京四中网校的答案