French language Q&A Forum

I assume it is a simple answer but am confused as to  when I must use infinitive vs past participle…with past conditional

Tu aurais fait un bon professeur  You would have made a good teacher

MAIS

J'aurais pu être un grand artiste.

I took a quiz. I translated "They are calling their dog" as Ils appellent leur chien. However, the correct answer was: Ils s'appellent leur chien. How does one know when to use the reflexive?

 Samedi matin nous allons faire des cours et l'aprés midi j'aurais un examen de français pendant 2 heures. 

I know that typically, retourner is used to mean "to go back" and rendre is used to mean "to give back." But on this page: https://www.lawlessfrench.com/grammar/auxiliary-verbs-2/ , which discusses using variable auxiliary verbs in the passé composé, it mentions that retourner can also be used transitively and in that case, it changes its meaning to "to give back." So in the passé composé, can retourner be used in the same way that rendre is?

For example, would both of these be correct?

1. J'ai rendu le livre à la bibliothèque.

2. J'ai retourné le livre à la bibliothèque.

Since girls are hugging each other… why are we not using s’enlacées  ? 

I have seen the phrase avoir à a couple times, and I was wondering how it differs from il faut and devoir - is it a less formal version of both of them, a more informal iteration of only one, or is it a completely different idea that it expresses

brrrrrrrrrrrrrr

What does this mean, kindly illustrate it with an example.

When the subject of your interrogative sentence is a noun, this one comes first and it's then repeated by the matching pronoun

why is there a 'de' before 'partager' here? what is this for?