The series of five games was completed yesterday.
一连串五场的比赛昨天已结束。
A series of lectures is scheduled.
There has been a whole series of accidents on the road recently.
最近在这条路上发生了一连串事故。
但如果对一系列的东西逐一加以考虑时，谓语动词也可用复数形式。
A serious of problems is / are to be discussed at the meeting.
以下是英国BBC节目中的原文：
Series 3 returns to your scree