Learn Hardcore German: Ich zeige ihm den Park.

The verb zeigen is ditransitive: it takes a dative indirect object (the person you show something to) and an accusative direct object (the thing shown). ihm is the dative form of er (“he”). If you used ihn, you’d be making “him” the direct object, which doesn’t match the pattern of zeigen.

Why is den Park in the accusative case and not der Park or dem Park?

Park is a masculine noun (der Park). As the direct object of zeigen, it must be in the accusative. The masculine accusative singular article is den. der is nominative (“the park” as subject) and dem is dative (“to/for the park”), neither of which fit here.

Why does zeigen take both a dative and an accusative object?

Some German verbs, like geben, schenken, and zeigen, are ditransitive: they naturally express “someone does something to/for someone else.” In this pattern the person receiving or affected is dative and the thing given, shown or told is accusative.

Why does the pronoun ihm come before the noun den Park?

German word‑order rules for objects say that a pronoun (ihm) usually precedes a full noun phrase (den Park). If you had two nouns, word order can be more flexible, but with one pronoun and one noun the pronoun goes first.

Could you say “Ich zeige den Park ihm.”? Would it still be correct?

Grammatically it’s possible, but it sounds awkward. Placing den Park first puts extra focus on the park itself. In everyday speech you’d keep the natural order Ich zeige ihm den Park.

In English we say “show someone something.” Don’t we need a preposition like to in German?

No. German uses cases instead of a preposition with zeigen. The dative case marks the indirect object (“to someone”), so you don’t add a preposition like to.

What if I replace den Park with a pronoun? Do I say Ich zeige ihm ihn or Ich zeige ihn ihm?

When both objects are pronouns, the accusative pronoun usually comes first. Since ihm is dative and another pronoun for “it” in accusative (if Park → es, for example) would be es, you’d say Ich zeige es ihm. If Park were masculine and you really used ihn, it would be Ich zeige ihn ihm, though this sounds a bit clumsy.