Indirect object pronouns tell to whom, for whom or from whom an action is directed. In the sentence “He wrote Sarah the letters” the indirect object noun is “Sarah”. If the indirect object noun is replaced by an indirect object pronoun “her” the sentence would read: “He wrote her the letter”.
Indirect object pronouns may either be placed before the conjugated verb or be added to the end of the verb in the infinitive or present participle.
Examples:
1. Le traje el libro ayer. – Yesterday I brought him the book/ I brought the book for him yesterday.
2. Te voy a tocar una canción cubana. – I am going to play a Colombian song for you.
3. Les explicaré el itinerario. – I will explain the itinerary to them.
4. Le compré las revistas a Julia. – I bought the magazines from Julia. /I bought the magazines for Julia.
5. Le pedí el menú al camarero. – I asked the waiter for the check.
(Note: To introduce the indirect object noun the preposition “a” is used)