1 used to give a positive answer to a question, for saying that sth is true or correct or for saying that you want sth （用于给予肯定回复，确定某事属实、正确，或表示想要某物）: ‘Are you having a good time?’ ‘Yes, thank you.’ “你是不是玩得很开心？”“是的，谢谢。”‘You're married, aren't you?’ ‘Yes, I am.’ “你已经结婚，对吗？”“对。”‘May I sit here?’ ‘Yes, of course.’ “我可以坐在这里吗？”“当然可以。”‘More coffee?’ ‘Yes, please.’ “要再来一点咖啡吗？”“好的，谢谢。”

2 used for showing you have heard sb or will do what he/she asks （用于响应呼唤）: ‘Waiter!’ ‘Yes, madam.’ “服务员！”“来了，女士。”

3 used when saying that a negative statement that sb has made is not true （用于表示某否定句内容不实）: ‘You don't care about anyone but yourself.’ ‘Yes I do.’ “你只顾自己不顾别人。”“我才不会呢。” [OPP] no 反义词为noyes noun [C] (plural yeses /ˈjesɪz ||; ˈjɛsɪz/) Was that a yes or a no? 那算是赞成还是不赞成？