Put these statements in prenex normal form.
a) $\exists x \ P(x) \vee \exists x \ Q(x) \vee A$, $\textit{where A is a proposition not involving any quantifiers.}$
b) $\neg (\forall x \ P(x) \vee \forall x \ Q(x))$
c) $\exists x \ P(x) \rightarrow \exists x \ Q(x)$
I just need a hint.