Answer:
The answer is explained below.
Step-by-step explanation:
A participle is a word formed from a verb that is used as an adjective or as a noun (such as working class;) these participles are also used to form compound verb forms (as is playing; have gone.) In the excerpt, the complete participle phrase is walking shoes.
The main verb refers to the most important verb in a sentence or phrase. In this case, the verb is be.