single可以修饰复数名词，最常见的意义为“单身的，独身的，未婚的”，以下例句均来自于《柯林斯高阶英汉双解学习词典》：

Single people are treated as an aberration and made to pay a supplement.  独身者被当成异类，而且要付一笔额外的费用。

Single parents cope heroically in doing the job of two people. 单身父母扮演双亲的角色非常辛苦。

All single full-time students must reside in university residence halls. 所有单身的全日制学生都必须住大学宿舍。

Their fellow travellers are a mix of honeymooners, single girls on the prowl and elderly couples. 他们的旅伴中有度蜜月的新人，有寻觅伴侣的单身女孩，也有老年夫妇。

The lack of childcare provisions made it difficult for single mothers to get jobs.  由于缺乏保育服务，单身母亲很难找到工作。

▲间或也可修饰表事物的复数名词。如：

She lives in single quarters now.  现在她住在单人营房。《简明英汉词典》

He trained his camera on nature, sometimes zooming in to examine single leaves. 他把自己的照相机对准了大自然，时而拉近镜头仔细观察一片片的叶子。《柯林斯高阶英汉双解词典》