In French, to express "when/while I do [something]", you use "quand/pendant que" + Le Futur Simple.
How to use "quand/pendant que" with Le Futur Simple (Indicatif) in French
Here is a sentence in English using when, where the actions all take place in the future:
Notice how the verb after when in these sentences is in the Present tense.
Now look at these sentences using quand in a future context:
Notice how in French you use the Le Futur in both parts of the sentence, including after quand, whereas in English you use the Present tense after when.
This rule also applies to the expression pendant que (while) when used in a future context:
Also see advanced lesson Quand/lorsque/après que/une fois que + future perfect (Le Futur Antérieur) = When/after I've done something in the future (Sequence of Tenses in French)
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