Like all future forms, the Simple Future cannot be used in clauses beginning with time expressions such as: when, while, before, after, by the time, as soon as, if, unless, etc.
Instead of Simple Future, Simple Present is used. Look at these examples:
As soon as I get home, I'll phone you.
When you arrive tonight, we will go out for dinner.
While Peter is sleeping, they will be playing with their Playstation.
By the time the teacher comes in, we'll have finished our tasks.
Practice: Exercise1, Exercise2, Exercise3.
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