1. El camarero trae el menú a mí.
2. Compré los libros para tí.
3. Le escribo una carta a mi novia.
4. Pagamos la cuenta a Julio por su cumpleaños.
- Se la pagamos por su cumpleaños..
5. Ellos dicen su número de teléfono a nosotros.
Explanation:
The object direct replace the accompanying noun, write a direct object. They can be replaced if it is masculine it is "lo" (singular) or "los" (plural) and if it is feminine it is "la" (singular) or "las" (plural).
The indirect object replaces the one who receives the verb. It can be replaced, if it is in the third person, "le" (singular) or "les" (plural); they can also be replaced by unstressed pronouns (me, se, te, nos, os).
When a direct object and an indirect object are joined, the indirect object must be put first and then the direct object. When a third person indirect object is added, put "se".
MissSpanish