I have found some articles_concerning_the harmful effects of drinking.为什么用-ing形式?

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Ihavefoundsomearticles_concerning_theharmfuleffectsofdrinking.为什么用-ing形式?Ihavefoundsomearticles_conc

I have found some articles_concerning_the harmful effects of drinking.为什么用-ing形式?
I have found some articles_concerning_the harmful effects of drinking.为什么用-ing形式?

I have found some articles_concerning_the harmful effects of drinking.为什么用-ing形式?
concer 加ing变为分词结构作article的定语