$1.$ Expand in a two$-$object universe $($the objects are named $\text{'}$a$\text{'}$ and $\text{'}$b$\text{'})$

$($a$)($x$)(($Ay v Bx$)$ Da$)$

$($b$)$ ~ $($Ex$)$ ~ $($Ay $$ Cx$)$

$($c$)($Ez$)$ ~ ~ $($Dz $($Hx & ~Gx$))$

Expanding a wff is not the same as reducing the wff to conjunctive normal form $($or reducing it to disjunctive normal form$).$ Read the text and my handout on how to do an expansion.