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,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···

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