How to pronounce “action word” in English

For example, if I say, "While driving down the freeway," would you believe that, that, that whole phrase is an adjective? I'm describing somebody who's driving down the freeway andthe word in that opening phrase that is the descriptive word is the word "driving." So when an opening phrase has an action word, like "running," "walking," "swimming," "dancing,""driving," "researching," "analyzing," "deciding," it doesn't matter; that word is trying to describe somebody or something. It's usually a somebody and whoever it is has to follow