Quand, lorsque, après que, une fois que + Le Futur Antérieur = 'when, after I've done in the future

I believe you are correct. I have only ever known those two words to be interchangeable.

Many thanks Megan. Can anyone else confirm this?

You use the future tense when to events happen in the future, regardless of their durations. For example: "Quand je serai vieux je vivrai à la campagne." Now let's make this into a bit contrived example using le futur antérieur: "Quand j'aurai vieilli, je vivrai à la campagne."

The first example concerns two points in time: being old and living in the countryside. The second example is different: "when I will have aged" refers to the end of a process. Hence the futur antérieur.

-- Chris (not a native speaker).

By the way, the example given in the lesson "When I have finished my work I will watch TV". This is, in fact, improper English since in English as well one would need to use the future perfect tense: "When I'll have finished my work I'll watch TV".

-- Chris.

Chris, it is proper English, at least in the U.S. I've never heard a native speaker say "when I'll have finished my work ...".

Hi Max, I'm not sure I understood what you mean. Do you have an example of what you might say instead?

Bonjour Susan,
Aurélie addresses this in the opening statement on the lesson:
«Here is a sentence in English using 'when' to express an action that will have been completed in the future before another action:
When I have finished my work, I will watch TV.
When I finish my work, I will watch TV.
Notice how the verb after 'when' is in the Present Perfect or Present tense.»

I hope you find this useful.
bonne chance

I guess my questions is really what is the present perfect?

Bonjour,
From the Education First website, we have this definition of the Present Perfect tense:
"DEFINITION OF THE PRESENT PERFECT TENSE
The present perfect is used to indicate a link between the present and the past. The time of the action is before now but not specified, and we are often more interested in the result than in the action itself."
Here is an explanation of the uses of the Present Perfect tense:
"THE PRESENT PERFECT IS USED TO DESCRIBE
An action or situation that started in the past and continues in the present. I have lived in Bristol since 1984 (= and I still do.)
An action performed during a period that has not yet finished. She has been to the cinema twice this week (= and the week isn't over yet.)
A repeated action in an unspecified period between the past and now. We have visited Portugal several times.
An action that was completed in the very recent past, expressed by 'just'. I have just finished my work.
An action when the time is not important. He has read 'War and Peace'. (= the result of his reading is important)
Note: When we want to give or ask details about when, where, who, we use the simple past. Read more about choosing between the present perfect and the simple past tenses."
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I, myself, had to reread this to refresh the present perfect.
Here is the page link for this site:
http://www.ef.com/english-resources/english-grammar/present-perfect/
And here are a couple more links that address this English tense:
http://www.englishtenses.com/tenses/present_perfect
https://www.englishclub.com/grammar/verb-tenses_present-perfect.htm
https://www.merriam-webster.com/dictionary/present%20perfect
https://www.ego4u.com/en/cram-up/grammar/present-perfect-simple
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Hopefully, by reviewing these links, you will grasp a better understanding of this verb tense.
Bonne chance et bonne continuation dans vos études en français.

It appears that the Present Perfect is a term for English grammar. What is the french equivalent?

I think we have come full circle:
Notice how the verb after 'when' is in the Present Perfect or Present tense.
Quand j'aurai fini mon travail, je regarderai la télé.
When I have finished my work, I'll watch TV.
Nous irons au cinéma quand nous aurons rangé notre chambre.
We'll go to the cinema when we have tidied our room.
Quand elle sera arrivée chez nous, la fête commencera.
When she's arrived at our place, the party will start.
Notice how in French you use the le Futur Antérieur after quand in order to show that this action will come before the other one.
The French equivalent is. . . . . . . le Futur Antérieur.

Bonjour Ron !

Tu viendras me voir quand tu auras mangé ton dessert.
Tu viendras me voir après avoir mangé ton dessert.

The meaning of these two sentences is indeed very close, just like it is in English:
You'll come and see me when you've eaten your dessert.
You'll come and see me after eating your dessert.

In our grammar exercises, we aim at testing specific structures, so we usually formulate our questions precisely as to specifically test what the lesson is about.
Though the meaning is close, these are two different sentences altogether :)

I hope that's helpful!
À bientôt !

Bonjour Yellamaraju !

Yes, it's an idiomatic way to say "to be aware of something / to know" = "être au courant".

You can also use "être le/la/les premier(s) à le savoir" which is literally "to be the first [one(s)] to know [it]".

This sentence could therefore have also been:
"Quand j'aurais pris une décision, vous serez les premiers à le savoir."

I hope that's helpful!
À bientôt !

Yes, thank you.

Bonjour Chris !

Here we're describing two different situations :)

In your sentence "Marie nous rejoindra quand noUs quitterons le restaurant.", the two actions are indeed simultaneous: us leaving the restaurant and her meeting us happen at the same time.
However, in the French sentence "Marie nous rejoindra quand nous aurons quitté le restaurant.", the action of leaving the restaurant will happen BEFORE Marie is meeting us.
Here "quand" is used in a sense closer to "une fois que" (once).
I think the issue here is actually the EN translation which doesn't reflect this nuance.
A better translation would probably be "Marie will meet up with us when we've left the restaurant.".
Would you agree?

Yes, I do understand the French side and would suggest a more precise English translation to remove ambiguity. --Chris.

Bonjour Ly !

"Lorsque" actually means the same as "quand" (when), so it's a bit different from "while". It doesn't mark simultaneity so much as something happening at one specific moment.
The best way to express simultaneity in this sentence would be as such:
"Je fais la vaisselle pendant que tu arrives." (I do the dishes while you're arriving.)

However, the use of "arriver" here feels a bit weird, as it is not an action that lasts as long as doing the dishes, so the simultaneity here feels a bit contrived.
Something like ""Je fais la vaisselle pendant que tu fais le lit." (I do the dishes while you're making the bed.) feels a bit more natural.

I hope that's helpful!

Thank you for your answer with explanation.
So to express simultaneity, we use "pendant" it's better than " lorsque " that is used as "quand", right?

Yes, "pendant que" would be "while". "Pendant" on its own means "during".

Okey, I understand now, thank you very much and have a nice day!

Pendant Donne la duration de l'action.

Dans indiqué dans quel temps la action va commencer.