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?
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.