French language Q&A Forum

Les livres desquels je pense sont remarquable. The books I am thinking of are remarkable; the preposition here is de.

In the third line of the dialog, if using inversion "Savez-vous à quelle heure nous atterrissons?", the audio in the exercise has several extra words that do not match the text. I can't remember exactly what they were but at the beginning it says "Pascal", like there were cues for the dialog that were being read as the dialog.

Can anyone explain what the difference between the passe compose and past perfect forms of devoir are? google translate shows them as being the same thing:

J'ai dû faire quelque chose     -> I had to do something

J'avais dû faire quelque chose  -> I had to do something

Similarly what is the difference between the future and conditional forms:

j'aurai dû faire quelque chose  -> I should have done something

j'aurais dû faire quelque chose -> I should have done something

Thanks!

wow this story is so intresting