Question

please tell me why i have to go.
participle gerund infinitive

Explanation:

In the sentence "Please tell me why I have to go", the phrase "to go" is an infinitive. An infinitive is formed by "to" + the base form of a verb. A participle is a verb form used as an adjective (e.g., "broken" in "broken glass"), and a gerund is a verb form ending in -ing used as a noun (e.g., "swimming" in "Swimming is fun"). Here, "to go" follows the structure of an infinitive.

Answer:

infinitive