Five people ( ) in the traffic accident which happened last Friday.为什么填被动语态were injured

问题描述:

Five people ( ) in the traffic accident which happened last Friday.为什么填被动语态were injured
不能用injured(非谓语形式)做five people的定语吗?

这是一句完整句子,若不用 were injured ,句子就没有谓语动词了,不成句子了.
Five people (were injured) in the traffic accident which happened last Friday.