An infinitive is a verb form that typically begins with the word "to" followed by the base form of the verb. They function as nouns, adjectives, or adverbs within a sentence. Here are some examples of infinitives used in sentences:
Noun:
1. Her goal was to graduate with honors.
Adjective:
2. She had an unquenchable thirst to explore new cities.
Adverb:
3. He went to the store to buy a new laptop.