$1.$ Convert the following expression to canonical sum$-$of$-$products form.

$($A $+$ B$)($B$\text{'}+$ C$)($A$\text{'}+$ C$)$

$2.$ Convert the following expression to product$-$of$-$sums form.

A $.$ B $+$ A$\text{'}.$ B$\text{'}+$ B $.$ C