The most striking plot twist in English language:

In the beginning your teachers say that you cannot use "if" with "will". However, after reaching C1 level it turns out that you can use them together.

Here is the explanation:

We can use it when WILL means be willing to do sth

E.g., If she will meet us at the airport, that will save us a lot of time... ( If she is willing to do that)

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