Strolling tourists fill the streets of Rome. Identify the type of verbal used in the sentence above and the word it modifies. gerund: "tourists" infinitive: "streets" gerund: "Rome" participial: "tourists"

The Verbal here is : "strolling" - the only other verbal form here is the inflected verb, "fill".

(so we reject the options:

infinitive: "streets"

participial: "tourists")

this verbal modifies "tourists": the tourists are strolling - it has a function of an adjective.