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?

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