"je lui ai montré"? porquoi pas "je lui ai montrée"?

Question

Accepted Answer

Hi Estefania,
It is because of the following rule -
The direct object (les différents modèles ) is after the verb so no agreement is made.
Take a look at the following lesson which will explain further:
https://french.kwiziq.com/revision/grammar/special-cases-when-the-past-participle-agrees-in-number-and-gender-when-used-with-avoir-in-le-passe-compose-conversational-past
Hope this helps!

Answer

Here, it doesn't take agreement because "lui" is an indirect object; only direct objects require agreement.  In this sentence, the direct object (les différents modèles) comes after the verb.