第1个回答 2017-03-19
John does not do homework at weekends.
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weekend 一定要用复数形式weekends，因为是泛指周末（有多个周末）。
下边的例句来于英语词典：
1，I often fish/go fishing at weekends.
我常在周末去钓鱼。
2，We love to get out into the countryside at weekends.
我们周末爱到郊外去玩儿。
3，He likes to watch farces at weekends to relax himself.
他喜欢在周末看滑稽剧来放松自己。