He has lots of experience dealing with teenagers为什么用dealing不用deal?

He has lots of experience dealing with teenagers
为什么用dealing不用deal?

划分句子成分可帮助理
He 【主语】has【谓语】 lots of experience【宾语】 dealing with teenagers.【定语】
翻译：他有和青少年打交道的许多经验.
从成分和句意可知,dealing with teenagers是v-ing短语,作后置定语,修饰名词experience.
若用deal,可改为：
He has lots of experience 【which deals】 with teenagers.