Human: I need to know the difference between an infinitive and a gerund. How do I do that? Assistant: 
The difference between an infinitive and a gerund is that an infinitive is used as a verb phrase, while a gerund is used as a noun or adjective. An infinitive can be formed by adding “-ing” to the end of a verb, while a gerund is formed by replacing the “-ing” ending with “-ing”. For example, in the sentence "I want to go swimming", “swimming” is a gerund because it replaces the “-ing” ending.