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.
Now look at these sentences using "quand" in a similar context:
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.
Note that this rule also applies to the conjunctions lorsque (when), après que (after) and une fois que (once):
See also previous lesson Using Le Futur after "quand" and "pendant que" instead of Le Présent
Want to make sure your French sounds confident? We’ll map your knowledge and give you free lessons to focus on your gaps and mistakes. Start your Braimap today »