3 buffers in the human body and what are their conjugate acid-base pairs?

Question

I have Bicarbonate Buffer, Phosphate/Ammonia Buffer, and Protein Buffers, where my confusion lies in what would be there conjugate acid base pairs.......

Answer 1

CO3^2-/HCO3^- IS the conjugate pair.
H3PO4/H2PO4^- IS the conjugate pair.

Answer 2

Thank you i think i was over complicating the question