Still,nearly 15 million people are unemployed in the US and concerns about job security have clouded consumer confidence.这句话结构是怎么样的?为什么concern要加s?

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Still,nearly15millionpeopleareunemployedintheUSandconcernsaboutjobsecurityhavecloudedconsumerconfide

Still,nearly 15 million people are unemployed in the US and concerns about job security have clouded consumer confidence.这句话结构是怎么样的?为什么concern要加s?
Still,nearly 15 million people are unemployed in the US and concerns about job security have clouded consumer confidence.这句话结构是怎么样的?为什么concern要加s?

Still,nearly 15 million people are unemployed in the US and concerns about job security have clouded consumer confidence.这句话结构是怎么样的?为什么concern要加s?
concern [kən'sə:n]
vt.涉及,关系到;使关心,挂念
n.C关系;U关心,挂念
公司,企业
在这句中nearly 15 million people are unemployed in the US是一句话,用and连接下面的一句话.
在后面那句中 ,concern是作为一个名词来用的,cloud才是句子的谓语动词,就是concerns···have clouded···