The answer is adverb, since the infinitive 'to make' acts as one :)
Is there a pic?
Because it sounds like there is...
Answer: Thank you for letting me borrow [item]. I appreciate being able to borrow it because [list your reason]. You are a generous person to share with me! If you ever want to borrow anything from me, please let me know.
Thanks again!
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What is the image the question is talking about anyway?? Theres no image attached