Answer:
The Spanish Indirect Object Pronouns are used to replace a word or phrase, which in the sentence, fulfills that function. They are usually placed before the verb, when this is conjugated. If the verb is not conjugated, then the indirect object pronoun is placed after the verb.
Explanation:
If it has a correct gender specific noun. If its singular or plural. Irregular verbs. The fact there is two different verbs. Past tense or current. Verb of change. Spanish prepositions. Direct and indirect pronouns. The word gustar.