In order for there to be an indirect object in a sentence there has to be a direct object.
Direct objects "directly" receive what the verb is doing - I read a book. READ what? - book
Indirect objects answer the questions:
TO or FOR WHOM is that book being read. - I read her a book every day.
When you can put the words "for" or "to" into the sentence without changing its meaning,
providing, of course, that you recognize the direct object, then you have found the indirect:
I read a book to HER. Yo le leo un libro todos los dias. (dias needs accent on "i")
Both direct and indirect object pronouns can also attach to infinitives (whole verbs without conjugations - ex: leer, hablar, decir)
and "ing: forms- ex; leyendo, hablando, diciendo (with some verbs, slight spelling changes occur)
Ex: I am going to read her a book. Yo voy a leerle un libro.
*She is telling them right now! *Ella esta diciendoles ahora mismo. (should have accents on "a" in esta and first "e" in diciendoles) for correct stress of syllable)
*In this case, the direct object is "hidden' - it is whatever is being told
Then you ask yourself, TO WHOM is it being told - TO THEM (which makes the word 'them) the
Your teacher may specify if he/she wants to see you use examples of attaching the pronoun or not.
Pay careful attention to the instructions.
Feel free to submit more questions and don't hesitate to let me know if it's tricky, especially certain grammar points. We'll find a way together for you to comprehend. Everyone learns differently.