Personal Pronouns in the Accusative Case
Aside from the nominative case, most of the German pronouns are declined in each of the four cases. Like in English, when the subject becomes the object, the pronoun changes. For instance, "ich" changes to "mich" (accusative object) as in "Ich sehe mich" (I see me). In the accusative case of the third person pronouns, only the masculine gender shows the change, thus neither the feminine "sie" nor the neuter "es" change. For example, "Er/Sie/Es mag ihn/sie/es" (He/She/It likes him/her/it).