weekend指一个周末，指星期六和星期天；而weekends指每个周末，并不是指一个周末而是多个或指每逢周末，这时就在weekend后加s。

weekend的用法

1、She had agreed to have dinner with him in town the following weekend.

她答应下一个周末和他在城里共进晚餐。

2、He told me to give you a call over the weekend.

他让我周末给你打个电话。

3、I went home at the weekend

我周末回家了。

4、Are you doing anything over the weekend?

你在周末有什么安排吗？

5、I also bought some casual clothes for the weekend.

我还买了些周末穿的休闲装。

weekends的用法

1、Esther used to visit him for the occasional days and weekends.

埃丝特过去会偶尔在周末或别的日子来探望他。

2、Jim gardened at the homes of friends on weekends.

吉姆周末帮忙打理朋友家的花园。

3、Bill would visit on weekends.

周末比尔会来。

4、They knock around on weekends in grubby sweaters and pants.

他们周末穿着邋遢的毛衫和裤子到处闲逛。

5、The farm is open to the public only during two open-house weekends.

该农场仅在两个周末接待日才对公众开放。