Answer:
Participle: Reminding
Word Modified: Guide
Step-by-step explanation:
A participle is a verbal acting as an adjective in a sentence. There are two types of participles: the present participle, which ends in “-ing,” like “rising,” and the past participle which is formed from the past tense of a verb, such as “swollen” and “saved.”
In the sentence provided, “Reminding the younger children to walk carefully” is the entire participle phrase, since it is modifying or adding further information to the noun “guide” (adjectives modify nouns). Now, the participle of this phrase is “reminding” (it is a verbal ending in “-ing”) and all the other words of the phrase are their objects and modifiers.