英语中有些名词的形式永远是复数形式,但其谓语动词既可用单数,也可用复数,这取决于前面的限定词.如：means, series, species.
series 举例：
1）There are four TV series programs.
2）This new series is beginning next month.
3）These new series of books have won the Award.
4) These new series are beginning next month.