coach不是集合名词，是一个英语单词，可以用作名词和动词，可以翻译为训练、辅导，教练，旅客车厢;长途客运汽车;四轮大马车。
第三人称单数：coaches过去分词：coached复数：coaches现在进行时：coaching过去式：coached
They've got a foreign coach。
他们请了个外籍教练。
She's frequently called into coach individual executive sonsprucing up their personalstyle."
她经常被邀请指导高管如何塑造自己的形象，体现个人风格。
