please provide an explnation of how to do question 5, I have the answers but am unsure how to solve

5. Using the information about zero-coupon bond prices and oil forward prices in the Table, construct the set of swap prices for oil for 1 through 8 quarters. \begin{tabular}{ccc} \hline Quarter & Zero-bond & Swap price \\ \hline 1 & 0.9852 & 21.0000 \\ 2 & 0.9701 & 21.0496 \\ 3 & 0.9546 & 20.9677 \\ 4 & 0.9388 & 20.8536 \\ 5 & 0.9231 & 20.7272 \\ 6 & 0.9075 & 20.6110 \\ 7 & 0.8919 & 20.5145 \\ 8 & 0.8763 & 20.4304 \\ \hline \end{tabular}