Why don't we use the future perfect instead?

Question

Accepted Answer

Bonjour Kenneth !

These are cases where the two actions in the sentence happen simultaneously:
When I'm old, I'll have a house.   =  "Quand je *serai* vieux, j'*aurai* une maison."

When one of the action happens before the other one but they are both in the future, you will indeed use the future perfect, or Futur Antérieur:
When I've finished my work, I'll have a nap.   =  "Quand j'*aurai fini* mon travail, je *ferai* une sieste."
Have a look at our related lesson:
https://french.kwiziq.com/revision/grammar/using-le-futur-anterieur-after-quand-lorsque-apres-que-une-fois-que-to-express-when-after-ive-done-in-sentences-in-future-tense

I hope that's helpful!
À bientôt !

Answer

Bonjour Rans !
Actually here is our two lessons related to après que, une fois que...
https://french.kwiziq.com/revision/grammar/how-to-use-apres-que-lindicatif-to-express-after-plus-verb
https://french.kwiziq.com/revision/grammar/using-le-futur-anterieur-after-quand-lorsque-apres-que-une-fois-que-to-express-when-after-ive-done-in-sentences-in-future-tense
Bonne journée !

Answer

Superb! My understanding now is that, this rule of using Le Futur in both parts of the sentence, including after quand also applies to after pendant que (while) in cases where the two actions in the sentence happen simultaneously.

Does this rule and scenario happen after apres que, lorsque, and une fois que? Or these must properly be followed ONLY by Le Futur Anterieur?

Answer

Good question. If you are meaning future perfect, which is Futur antérieur, is the sentence explaining something happened before the future action. Like, Il sera parti quand nous arriverons.