General: will/shall, going to, pres cont, pres simple: hoe zekerder het is, hoe verder in deze lijst het staat.
Will = spontaan, voorspelling zonder bewijs, beloftes/aanbod
I'll help you! (spontaan of aanbod)
You'll see: it'll rain again on my birthday.
Going to = intenties, eerder gemaakte afspraken, voorspelingen met bewijs.
I'm going to read that English book this weekend.
We're going to get married next year, we just don't have a date yet.
Look at those dark clouds! I think it's going to rain.