Indicate all of the pairs of compounds below that represent a conjugate acid$-$base pair.

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a $H_2\frac{S}{H}{S}^{-}$

b $,Mg\frac{(OH{)}_2}{M}gC{l}_2$

c$.H_{2}S\frac{O_4}{K}HS{O}_4$

d $C{H}_{3}C{O}_2\frac{H}{N}aC{H}_{3}C{O}_2$

e LiO$\frac{H}{N}$aOH