Question

when i was little, i liked to visit the giraffes at the zoo.
infinitive
gerund
participle

Explanation:

In the sentence "When I was little, I liked to visit the giraffes at the zoo", the phrase "to visit" is an infinitive. An infinitive is formed by "to" + the base form of a verb. A gerund is a verb form ending in -ing that functions as a noun, and a participle (like present participle -ing or past participle -ed) functions as an adjective or part of a verb phrase. Here, "to visit" follows the structure of an infinitive.

Answer:

infinitive