a group of,a party of,a crowd of,这些都是什么?他们在语法上被称做什么？

a group of a group of,a party of,a crowd of,这些都是什么?他们在语法上被称做什么？ a group of man 还是a group of men 为什么？ a group of enemies or ,a group of enemy 用a group of 造句. a group of 中文意思 a group of classmates是什么意思 A group of young birds! a group of 怎么用 英语翻译it was a group of men that included Gallo Leo’s father Venchesil,and they met in Florence he and a group of friends of the count of party and they formed what is called the Camerata Dayee Party. a group a group a group a group A group of stuents 是单数复数? 用with a group of frends 造句 A GROUP OF 变复数怎么变 group,a,of,people,are,young,swimming