a series of 名词复数 那后面加谓语用单数还是复数?为什么啊A series of football games (is)hold ....VS.A series of discussion groups have been....

Question

a series of 名词复数 那后面加谓语用单数还是复数?
为什么啊
A series of football games (is)hold ....
VS.
A series of discussion groups have been....

Answer 1

a series of 后可加复数名词,不可数名词.不管名词类别为何,动词通常用单数.
类似的还有 a portion of,a pile of,a panel of,etc.
关于补充问题：1.a series of 后面动词通常用单数.
2.当强调个体成员是可以用复数.