如何区分at weekend 与 on weekend

如何区分at weekend 与 on weekend in on at the如何区分 on weekends与at the weekend意思相同吗 on the weekend or at the weekend 英语中的at the weekend与on the weekend有什么区别?快来帮我! 我们说 on weekend ,at weekend,还是in the weekend 一下短语有什么用法区别?At weekend.On weekend.At the weekend.On the weekend. on与at的区别What do you usually do on the weekend?和What do you usually do at the weekend?ON与AT的区别 at weekend,on weekend,at the weekend ,on the weekend和on weekends的区别?尽量详细些... at the weekend 和 on the weekend的区别 on the weekend和at weekend用法一样吗? weekday 和weekend用on还是at at weekand 和on weekend的区别 at weekand 和on weekend的区别 at/on weekend的同义词是什么 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 time 与 at time 与 at times区分三者. on weekend与on weekends的区别?