单词on weekends,on the weekend,at weekend的区别

on weekends：在周末；每逢周末；每周末
例句：

1.He never gets up early on weekdays , let alone on weekends .
他平日从不早起，更不用说周末了。
2.My mother often asks me to help her with the housework on weekends.
我妈妈经常要我在周末帮助她做家务。

on the weekend：在周末；在这个周末
例句：
1.Mr. Smith: We'd like to hold a party for her on the weekend. Can you comesometime with your husband?
史密斯先生：我们打算在周末为她开个派对。你和丈夫到时候能来吗？
2.What you do on the weekend obviously depends on the weather, if it's niceand warm outside we often play in the water.
你周末干什么显然要看天气而定，如果是挺暖和的，我们经常在外面玩水

at weekend：在周末
例句：
1.The nugget will be on display this weekend at the Sacramento ConventionCenter, she said.
金块这周将会在萨克拉门托会议中心展出。
2.Elizabeth, 24, stops for a moment as she thinks about Heather, who oftenspends the weekend at her home.
24岁的Elizabeth停下来想了想Heather，她经常到她家陪她过周末。