Human: I'm a little confused about the difference between a preposition and a gerund. Can you clear it up for me? Assistant: 
Prepositions are words that indicate the relationship of one thing to another, such as 'in', 'at', or 'with'. Examples: "The car is in the garage." "The cat is at the window." "I am with my friends." Gerunds are verbal nouns used as a verb; they describe an action or state of being. Examples: "Running is good exercise." "Being happy is important."