quand vs après que

Question

For this translation: We will call you when we've taken the train,
The correct answer used quand but I used après que. This was marked wrong. Aren't these two interchangeable?

Answer

Bonjour Ann,
I have had a similar experience using a phrase that means the same; however, in this case, «quand» is the lesson key so anything that varies from that use would be incorrect.  As in English, there are always multiple, correct ways to phrase a sentence.

J'espère que cela vous aidera.

Answer

Bonjour Ann !

You are right: this was a question that had fallen through the checks, but "après que" should indeed be marked as a correct answer here, and thanks to your eagle eye, it's now been fixed :)

Merci beaucoup et à bientôt !

Answer

Oh, je suis heureuse d'être à ton aide!!