fromEnglish Grammar Today
We don’t use the present continuous when we predict something:
You’re going tofail the exam unless you attend more classes.
Not:You’re failing the exam, unless…
When we make an immediate decision, we use’llnotwillorshallor the simple present tense:
Wait a minute, I’lllend you my car.
Not: …I shall lend you my car. or …I lend you my car.