Placement of tout as object of infinitive

Question

This is doing my head in... My grammar exercise book has:

1. Nous devons fermer tous les volets. -> Nous devons tous les fermer.

2. Elle va faire toutes ses courses au supermarché. -> Elle va toutes les faire.

BUT

3. Nous souhaitons recevoir tous nos amis pour notre anniversaire de mariage. -> Nous souhaitons les recevoir tous.

My textbook gives no explanation as to why tous/toutes comes before the object pronoun in 1,2 but after the infinitive in 3.

Accepted Answer

Bonjour Ruth,
Given that the Forum is set up to help Kwiziq members navigate and benefit from the lessons and exercises, perhaps the lesson on this subject will help explain to you and also augment your grammar book explanations.
https://french.kwiziq.com/revision/grammar/tout-tous-and-toute-toutes-all-all-of-them-the-whole-indefinite-pronouns
 
Bonne continuation
Jim