a group of後面跟單數還是複數

後邊加複數，例如：

1、A group of kids were playing with a ball in the street.一羣孩子在街上玩球。

2、There was a group of youths standing on the street corner.有一羣年輕人站在街角。

3、The story is built around a group of high school dropouts.故事圍繞着一羣輟學的中學生展開。

a group of +名詞，表示一個什麼團隊（小組），是單數。例如

this is a group of cave exploration

這是一個山洞探險隊