Given that the following sentences are not logically equivalent, can you find an example structure in which one sentence comes out true while the other false? For instance, if L(x) indicates x > 5, and P(x) indicates x < 7 - what's the difference between the two phrases?
$\forall a.\exists b. (L(b) \to P(a))$
$\forall a.((\exists b.L(b)) \to P(a))$
At first look they both seem identical, but they actually aren't.