Answer:
past participle
Step-by-step explanation:
According to the given lines from a long poem by Robert Frost about choosing between paths in a forest, the verbal that is used in these lines is past participle.
This is because, a past participle is a type of verb that usually ends with the suffix "-ed".
Therefore, the answer is past participle because, from the sentence "Two roads diverged in a wood...", the word "diverged" is a past participle.