play sevens
sevens 指七人制橄榄球这项运动，作不可数名词，前面一般不加冠词。
He plays sevens for his country every summer.
他每年夏天代表国家参加七人制橄榄球比赛。
七人制橄榄球
七年之痒；(因对配偶生厌而)想找个新的性伴侶( seven的复数形式 )
七人制橄榄球
Rugby sevens.
Every Friday, my friends and I get together to play sevens.
每个星期五，我和朋友们聚在一起玩七牌游戏。
用法提示：sevens 指一种名为七牌游戏的纸牌游戏。
In the game of sevens, players try to get rid of all their cards by playing them in ascending order.
在七牌游戏中，玩家通过按升序出牌来尽力出完所有牌。
用法提示：sevens 是这种纸牌游戏的名称，玩家需按特定顺序出牌。
She won the round of sevens by playing her last seven.
她通过打出最后一张七点牌赢了这局七牌游戏。
用法提示：sevens 指游戏名称，而 seven 指牌面为七的牌。
sevens 指七人制橄榄球这项运动，作不可数名词，前面一般不加冠词。
He plays sevens for his country every summer.
他每年夏天代表国家参加七人制橄榄球比赛。
rugby sevens 是完整说法，口语中常直接简称为 sevens。
Rugby sevens is faster and more open than the fifteen-a-side game.
七人制橄榄球比十五人制比赛节奏更快、打得更开。
sevens 可直接放在名词前作定语，用来说明赛事的类型。
She is training hard for a sevens tournament next month.
她正在为下个月的一场七人制橄榄球锦标赛刻苦训练。
grammar · medium
易错句子He started playing rugby seven when he was ten.
正确表达He started playing rugby sevens when he was ten.
这项运动名称固定为 rugby sevens，是复数形式，不能因为指一项运动就写成单数 rugby seven；sevens 在这里是名称的一部分，不表示数量，因此不能用 seven 替换。
grammar · medium
易错句子Rugby sevens are extremely popular in Fiji.
正确表达Rugby sevens is extremely popular in Fiji.
rugby sevens 是运动项目的名称，作主语时视为单数概念，谓语用 is。不要因为词尾 -s 像复数就误用 are。
grammar · medium
易错句子She plays the rugby sevens every weekend.
正确表达She plays rugby sevens every weekend.
表示从事某项运动时，球类运动名称前不加定冠词 the；play 后直接跟 rugby sevens 即可。
seven 是基数词“七”，用来表示数量或号码；sevens 是名词，指七人制橄榄球这一项目，前面一般不加 a，也不用它来数数。
seventh 是序数词“第七”，用于排名或顺序；sevens 是名词，指七人制橄榄球，两者拼写和读音相近，但词性与所指完全不同。
rugby 是橄榄球运动的统称，包括十五人制等多种赛制；sevens 特指每队七人的赛制，常写作 rugby sevens 或 the sevens，范围更窄。
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