Which sentence handles the tense in a future time clause incorrectly?
I will email the receipt as soon as the payment will arrive.✓الإجابة الصحيحة
Before the guests leave, we will call a taxi for them.
Once the machine has cooled completely, the engineer will remove the cover.
We will stay under the shelter until the hail stops.
الشرح
The clause after as soon as wrongly uses will even though it is a future time clause and needs a present form. The other sentences keep future marking in the main clause and correctly use a present simple or present perfect in the time clause.